Tag: quirk

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Watch Fact of the Day: Why the Royal Oak’s “Screws” Don’t Turn

In 1970, Gérald Genta flipped the watch world on its head by introducing the Audemars Piguet Royal Oak, a timepiece rocking eight visible hexagonal fasteners that look like screws but behave more like the decorative knobs on a fancy cupboard. These “through-screws” don’t actually tighten at the front; they’re elegantly held in place and adjusted from the back. Think of them as screws with a flair for the dramatic—perfectly aligned for aesthetic pleasure rather than practical purposes. Who knew something so eye-catching could also be a structural hero? Welcome to watchmaking where function meets fashion, and everything else just ticks away!

📅 Friday, October 2, 2026

When Gérald Genta designed the Audemars Piguet Royal Oak in 1970, he created one of the most recognizable bezels in watch history.

Eight visible hexagonal fasteners.

Eight polished slots.

Eight perfectly controlled positions around an octagonal bezel.

To most people, they look like ordinary screws.

But they do not work like ordinary screws at all.

The Royal Oak’s visible fasteners are through-screws. Their hexagonal heads are captured inside matching hexagonal holes in the bezel, which prevents them from turning. From the rear of the watch, round nuts are threaded onto those screws and tightened to clamp the case together and compress the water-resistance gasket. AP Chronicles

That means the visible slot on the front is not used to tighten the watch.

It can simply be oriented precisely for appearance.

Watch Fact of the Day: Why the Royal Oak’s “Screws” Don’t Turn

THE FRONT DOESN’T TURN.

THE BACK DOES THE TIGHTENING.

And that is why the Royal Oak’s bezel slots can appear so perfectly aligned.

Why Genta Did It This Way

The Royal Oak’s design was inspired in part by the architecture of a diver’s helmet, with visible external fasteners becoming part of the visual identity rather than something to hide.

Genta’s 1970 sketch already showed the concept: a wide bezel, eight exposed hexagonal fasteners, and a large gasket compressed between the bezel and monocoque case. Audemars Piguet’s archives note that the hexagonal heads were intentionally captured so they would not rotate while being locked from below. AP Chronicles

That was radical at the time.

Traditional luxury watchmaking usually concealed functional hardware.

The Royal Oak put it on display.

FUNCTION BECAME DECORATION.

💡 Did You Know?

The neat slot alignment that collectors admire is actually the result of a clever engineering shortcut around a problem that watchmakers normally face.

Ordinary screws cannot simply be tightened until all their slots line up perfectly. Thread starts, screw lengths, tolerances, and final torque all determine where a screw head stops. That is why aligned screws are generally impractical in conventional watchmaking. Hodinkee

The Royal Oak gets around that problem because the front fastener doesn’t rotate during final tightening.

The nut on the back does.

That is the trick.

⭐ Why It Matters

The Royal Oak is full of details where engineering and aesthetics are inseparable.

The screws are not merely decorative.

The alignment is not fake.

And the system is not just visual theater.

The eight through-screws actually help clamp the case together and compress the gasket that contributes to water resistance. AP Chronicles

So one of the most famous decorative details in modern watchmaking is also a real structural part of the watch.

THEY LOOK LIKE SCREWS.

THEY DON’T TURN LIKE SCREWS.

AND THAT’S EXACTLY WHY THEY LINE UP.

This one is absolutely made for a W&M visual.

I’m seeing 1972 Swiss industrial-design magazine × Gérald Genta sketchbook × technical case cutaway.

Headline:

THE ROYAL OAK SCREWS THAT DON’T TURN

Then a cutaway:

HEXAGONAL HEAD
↓
LOCKED IN BEZEL
↓
THROUGH-SCREW
↓
NUT TIGHTENS FROM THE BACK

And the bottom payoff:

PERFECT ALIGNMENT

BY DESIGN, NOT LUCK.

Category: Fun Quirk

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Watch Fact of the Day: The Watch You Could Read With Your Fingertips

Way back when, before all the tech we have today, watchmakers created tactile or Braille watches for folks who couldn’t see the time. These watches had raised hour markers and hands you could feel, making time-checking super discreet and accessible. The concept isn’t new; similar designs date back to the late 1700s. By the early 1900s, watches specifically for the visually impaired were popping up. They featured protective covers and sturdy hands, allowing wearers to tell the time silently and privately. It’s a cool reminder: accessible design has roots that go way deep, proving independence can come from something as simple as touch.

📅 Friday, September 25, 2026

Long before talking watches, smartphones, or voice assistants, watchmakers found a remarkably simple way to make time accessible to people who could not rely on sight:

LET THEM FEEL IT.

Special tactile or “Braille” watches used raised hour markers and hands that could be read by touch. Many later examples used a hinged crystal or protective cover that could be lifted so the wearer could place a fingertip directly on the dial without damaging the watch during normal wear. The American Foundation for the Blind describes this as the traditional Braille-watch layout: lift the hinged crystal, then feel the hour markers and the positions of the hands.

The idea itself had deep roots. Watches designed to tell time by touch existed centuries earlier. Breguet sold its first famous montre à tact in 1799—a watch with an external pointer and hour markers that could be read without looking at the dial. Those watches were not originally created specifically for blind users, but the same basic principle—translating time into something tactile—would later become especially valuable for accessibility.

By the late 19th and early 20th centuries, purpose-built tactile watches were clearly being made for blind and partially sighted people. Museums Victoria preserves a mid-to-late-19th-century fob watch with raised numerals and Braille markings, and early-20th-century examples continued the concept into wristwatches.

How Did They Work?

A conventional watch tells time visually.

A tactile watch turns the dial into a physical map.

The wearer opens the protective cover and feels:

raised markers → where the hours are

short hand → the hour

long hand → the minutes

The hands had to be robust enough to tolerate gentle touch without being easily displaced, and the protective cover helped keep the dial and hands safe when the watch was closed.

That meant the time could be checked:

SILENTLY.

PRIVATELY.

WITHOUT LIGHT.

💡 Did You Know?

The history of tactile timekeeping is closely connected to another earlier watchmaking idea: reading the time in darkness.

The Smithsonian preserves a “touch watch” given to Helen Keller when she was young. Its design used pins around the case corresponding to the hours and an external moving hand that could be felt by touch. The watch had originally been developed as a way to tell time in the dark, but its tactile design made it especially useful for someone who was blind.

That gives us a beautiful through-line:

TIME BY SIGHT

became

TIME BY SOUND

and also

TIME BY TOUCH

⭐ Why It Matters

This is a great reminder that accessibility design is not a modern invention.

Watchmakers were solving accessibility problems mechanically long before electronics arrived.

No speaker.

No synthesized voice.

No vibration motor.

No screen reader.

Just:

HINGE.

RAISED MARKERS.

STRONG HANDS.

TOUCH.

And that gave blind and low-vision users something incredibly important:

independence.

The watch didn’t announce the time to everyone nearby.

It let the wearer discover it discreetly with a fingertip.

That makes these tactile watches more than curiosities.

They are early examples of inclusive industrial design.

BEFORE WATCHES TALKED…

SOME WERE MADE TO BE FELT.

Category: Fun Quirk

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Watch Fact of the Day: The 3D-Printed Titanium Watch That Breaks Traditional Design Rules

The emergence of metal 3D printing marks a transformative revolution in watchmaking, allowing designers to create intricate structures that were previously impossible with traditional methods. Techniques like Selective Laser Melting enable the construction of lightweight yet robust titanium cases, offering innovative designs such as the TAG Heuer Monaco Split-Seconds Chronograph Air 1. Brands like Panerai and independent artisans are also embracing this technology, incorporating unique aesthetics and complex geometries into their creations. This evolution not only expands creative potential but also harmonizes modern manufacturing with traditional craftsmanship, rejuvenating the world of horology with exciting new possibilities.

📅 Saturday, September 19, 2026

For most of watchmaking history, a metal case began as a solid piece of material.

Steel, gold, or titanium would be cut, drilled, milled, turned, and polished until the unwanted material was removed and the final shape emerged.

Metal 3D printing reverses that entire idea.

Instead of carving a watch case out of a solid block, technologies such as Selective Laser Melting (SLM) and Direct Metal Laser Sintering (DMLS) build titanium structures layer by microscopic layer from metal powder. A laser selectively fuses each layer according to a digital model until a complete three-dimensional component exists. TAG Heuer Official Magazine

And that changes what watch designers are physically capable of making.

Traditional machining works beautifully when cutting tools can reach the surfaces that need to be removed. But it becomes far more difficult when designers want internal cavities, enclosed channels, skeletal lattices, deep undercuts, or organic structures hidden inside a case.

Additive manufacturing can simply build those forms into the component from the beginning.

DON’T CUT THE EMPTY SPACE OUT.

BUILD THE EMPTY SPACE IN.

That sounds subtle, but it is a huge shift.

One striking modern example is the TAG Heuer Monaco Split-Seconds Chronograph Air 1, introduced in 2025. Its Grade 5 titanium case is produced using Selective Laser Melting, allowing TAG Heuer to create a dramatically hollowed architecture that the company says would be impossible to manufacture conventionally. The resulting case is less a traditional metal shell and more like a miniature structural chassis inspired by performance engineering. TAG Heuer Official Magazine

Panerai has been exploring a similar idea for years.

Its DMLS titanium cases are built layer by layer from titanium powder and can contain internal cavities that reduce mass while preserving the strength required from a large sports-watch case. Recent technical reporting on Panerai’s DMLS construction cites the brand’s claim that these cases can be about 25% lighter than conventional titanium versions of comparable design, while remaining more than 50% lighter than steel. Time and Watches

Independent watchmakers are pushing the aesthetic side even further.

Dutch brand Holthinrichs uses 3D-printed Grade 5 titanium to create skeletal lugs, complex architectural surfaces, and case geometries shaped by founder Michiel Holthinrichs’ background in architecture. Some models deliberately leave portions of the raw printed texture visible beside hand-polished surfaces, turning the manufacturing process itself into part of the design language. Fratello Watches

And emerging makers such as Apiar have used additive manufacturing to create titanium cases from thousands of extremely thin layers, including open lattice structures that would be considerably harder to realize through conventional machining alone. WatchPro USA

💡 Did You Know?

One of the most fascinating advantages of metal 3D printing is that a watch case can be solid where strength is required and hollow where material contributes little.

That means designers can think more like aerospace engineers:

LOAD PATHS → STRUCTURE

UNNECESSARY MASS → REMOVE IT

INTERNAL SPACE → ENGINEER IT

COMPLEXITY → PRINT IT

Instead of asking:

“CAN A CUTTING TOOL REACH THIS?”

they can ask:

“CAN WE DRAW IT IN 3D?”

That is a fundamentally different design philosophy.

⭐ Why It Matters

For centuries, watch design has been constrained partly by the tools used to manufacture watches.

Lathes encourage certain forms.

Milling machines encourage others.

Stamping creates another set of possibilities.

Additive manufacturing introduces a completely new vocabulary.

HOLLOW STRUCTURES

INTERNAL LATTICES

ORGANIC GEOMETRY

ULTRA-LIGHT TITANIUM

SHAPES THAT CAN’T EASILY BE MILLED

And here’s the part I love:

The finished object can still be hand-finished by traditional craftspeople.

So once again, new technology isn’t necessarily replacing traditional watchmaking.

It’s giving traditional finishing and mechanical horology new shapes to work with.

LASERS BUILD THE FORM.

HUMAN HANDS FINISH IT.

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Watch Fact of the Day: The Jaeger-LeCoultre Atmos Runs on Air Alone

Imagine a clock that runs on room temperature changes instead of batteries, motors, or your daily winding efforts—enter the Jaeger-LeCoultre Atmos! This genius contraption, dating back to 1928, uses a sealed capsule that flexes with temperature shifts, cranking itself up like a lazy friend who suddenly remembers they owe you lunch. With just a 1°C change, it can keep ticking for 48 hours, consuming less energy than a light bulb. So, if you want to impress your guests with a clock that’s basically a temperature leech, the Atmos is the way to go—just don’t forget to keep your thermostat cozy!

📅 Tuesday, September 15, 2026

Imagine a mechanical clock that you never plug in, never replace a battery in, and normally never wind by hand.

That is the extraordinary idea behind the Jaeger-LeCoultre Atmos.

Its mechanism traces back to an invention by Jean-Léon Reutter in 1928, later developed and brought to market by Jaeger-LeCoultre during the 1930s. Instead of depending on a conventional winding routine, the Atmos captures tiny changes in the temperature of the room around it and converts those changes into mechanical energy.

At the heart of the system is a hermetically sealed capsule connected to the clock’s mainspring mechanism. As the surrounding temperature rises or falls, the material inside the capsule expands or contracts. That movement flexes a membrane and gradually winds the clock.

No motor.

No wall plug.

No daily winding ritual.

Just:

TEMPERATURE CHANGES → CAPSULE MOVES → MAINSPRING WINDS → CLOCK KEEPS RUNNING

Jaeger-LeCoultre says a change of only 1°C in ambient temperature can provide approximately 48 hours of power reserve. That is possible because the Atmos consumes an astonishingly small amount of energy. Its slow-moving ring-shaped balance operates at just 0.02 Hz, and the manufacture says it consumes roughly 250 times less energy than the balance of a conventional wristwatch.

That efficiency is really the secret.

The Atmos does not produce energy from nothing.

Instead, it needs so little energy that ordinary temperature fluctuations in a room can supply enough mechanical work to keep it operating. Jaeger-LeCoultre even calculates that approximately 60 million Atmos clocks would consume the same amount of energy as a single 15-watt light bulb.

And that gives the Atmos one of the most poetic operating principles in horology.

A sunny afternoon warms the room slightly.

Night arrives and the temperature falls.

The sealed capsule responds.

The mechanism quietly winds itself.

The clock continues.

💡 Did You Know?

The Atmos became so closely associated with Swiss craftsmanship that it was used as an official gift of the Swiss Confederation and became known as the “President’s Clock.” Jaeger-LeCoultre notes that heads of state and prominent visitors to Switzerland received examples during the 20th century.

But the part I love most is still the engineering.

A temperature change most of us would never even notice—

1°C

—can give the Atmos enough stored energy for roughly:

48 HOURS OF TIMEKEEPING.

⭐ Why It Matters

Most mechanical timepieces are designed around storing energy that we deliberately give them.

Wind the crown.

Wind the key.

Move your wrist.

Replace the battery.

The Atmos takes a completely different approach.

It quietly harvests energy already present in the environment.

That makes it less like a conventional clock and more like a tiny mechanical energy-harvesting machine.

NO BATTERY.

NO ELECTRIC MOTOR.

NO DAILY WINDING.

Just:

TEMPERATURE → ENERGY → TIME

Category: Fun Quirk

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Watch Fact of the Day: The 1970s LED Watch Designed for Drivers

In the wild and wacky world of 1970s watches, the Bulova Computron strutted onto the scene like a flashy futuristic disco ball. With its dazzling red LED display angled right at your face, this timepiece was less “watch” and more “dashboard for your wrist.” Forget wrist rotations; just a quick side glance got you the time while you cruised at breakneck speeds. No round dials, no hands, just pure electric glory in a trapezoidal shape. Basically, if you wanted to feel like a space-age driver while checking the time, the Computron was your ticket to the future—one battery-saving light show at a time!

📅 Monday, September 14, 2026

Introduced in the mid-1970s, the Bulova Computron became one of the most futuristic digital watches of its era. Instead of placing the display flat on top of the wrist like a conventional watch, Bulova angled the glowing red LED readout toward the wearer—an arrangement that made it especially easy to glance at while driving.

The Computron’s shape was unlike almost anything else on the market. Its trapezoidal case, integrated bracelet, and recessed red LED display looked more like a piece of automotive instrumentation than a traditional wristwatch. In an era obsessed with space-age design, electronic technology, and the promise of a computerized future, the Computron looked exactly like a watch from tomorrow.

That angled display gave it a practical advantage. Rather than rotating the wrist dramatically to see the time, the wearer could glance toward the side of the case. This made the Computron especially appealing to motorists and helped cement its reputation as one of the classic “driver’s watches” of the digital age.

Like most early LED watches, the display was not continuously illuminated. LEDs consumed significant battery power, so the wearer typically activated the display only when needed. Press a control, and the dark face suddenly came alive with glowing red numerals—a tiny electronic light show on the wrist.

💡 Did You Know?
The Computron’s design was almost the opposite of a normal watch.
Traditional watches are built around the idea that the dial should face directly upward.

The Computron asked a different question:

WHAT IF THE DISPLAY FACED YOU INSTEAD?
That one design decision transformed the watch from a simple digital timekeeper into something that felt more like a dashboard instrument worn on the wrist.

⭐ Why It Matters
The Computron is a perfect example of how radically watch design changed during the 1970s.
This was a period when brands were no longer limited by the visual language of mechanical movements, round dials, and traditional hands. Electronic technology gave designers permission to rethink what a watch could look like.
The Computron embraced that freedom completely.

NO HANDS.
NO ROUND DIAL.
NO TRADITIONAL WATCH SHAPE.

Just:
RED LEDs.
ANGLED DISPLAY.
PURE 1970s FUTURISM.

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Watch Fact of the Day: The 19th-Century Timekeeper That Used Mercury to Stay Accurate

Back in the day, clockmakers were on a mission to combat the effects of temperature on their timepieces. They created mercurial pendulums, where mercury in a jar at the bottom adjusted to heat changes, keeping clocks accurate. This nifty solution was a big deal before the advent of quartz and atomic clocks. While it was an impressive engineering feat, mercury wasn’t the safest material to work with. Eventually, better and safer methods replaced it, but the mercurial pendulum remains a cool example of how creativity and science played a role in crafting precise timepieces. Horology has always been about innovation, not just gears!

📅 Sunday, September 13, 2026

Long before modern alloys and electronic regulation, precision clockmakers searched for clever ways to fight one of timekeeping’s greatest enemies: temperature. As the weather changed, pendulum rods expanded and contracted, altering a clock’s rate. To solve the problem, some 19th-century regulators and observatory clocks used a mercurial pendulum, in which a jar of mercury at the bottom of the pendulum helped offset those changes. As the pendulum rod expanded downward in warmer temperatures, the mercury’s surface rose upward, compensating for the shift and helping the clock maintain far better accuracy.

The idea was both elegant and scientifically ingenious. Rather than fighting physics directly, clockmakers used one physical reaction to counteract another. This made mercurial pendulums an important step in the long quest for precision timekeeping, especially in observatory and regulator clocks where even tiny errors mattered. Before quartz and atomic timekeeping, this was cutting-edge technology—proof that great horology has always been as much about clever engineering as beautiful craftsmanship.

Of course, mercury came with obvious drawbacks. It was heavy, delicate to handle, and hazardous by modern standards, which meant these systems were never especially practical outside high-precision clockmaking. Over time, improved compensation pendulums and safer materials replaced them. Still, the mercurial pendulum remains one of the most fascinating examples of watchmakers and clockmakers using the science of their era to solve the eternal problem of keeping better time.

💡 Did You Know?

The mercurial pendulum wasn’t designed to make a clock run faster or slower on its own—it was designed to help the clock stay consistent as temperatures changed. That distinction made it a major breakthrough for scientific and observatory-grade timekeeping.

⭐ Why It Matters

This story shows that horology has never been just about gears and springs. It has always been about creative problem-solving. Long before computers and electronics, clockmakers were already using chemistry, physics, and materials science to chase greater precision.

Category: Fun Quirk

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Watch Fact of the Day: The Wristwatch That Uses Physics to Heal Its Own Timekeeping

Francois-Paul Journe went big with his F.P. Journe Chronomètre à Résonance—this watch uses not one but two balance wheels for timekeeping! Launched in 2000, it’s based on the idea of resonance, allowing the two movements to sync up naturally when they’re tuned close enough. So, when you move your wrist, if one balance speeds up, the other slows down to keep everything in check. It’s a clever twist on traditional watchmaking, where usually you’d try to block disturbances. Journe’s design proves that two delicate systems can work together to combat movement, changing the game in wristwatch accuracy.

📅 Friday, September 11, 2026

Most mechanical watches rely on a single balance wheel—the tiny oscillating regulator whose rhythmic motion determines how accurately the watch keeps time.

François-Paul Journe decided to use two.

The result was the F.P. Journe Chronomètre à Résonance, unveiled as a wristwatch in 2000 after Journe had spent years pursuing one of horology’s most fascinating physical phenomena: resonance. F.P. Journe

The idea sounds almost impossible.

Inside the original Chronomètre à Résonance are two independent movements, each possessing its own escapement and balance. When their frequencies are adjusted sufficiently close to one another—F.P. Journe specifies a difference of no more than five seconds per day accumulated across six positions—the two oscillators begin interacting through resonance and naturally settle into synchronized opposition. F.P. Journe

Infographic detailing F.P. Journe's innovative wristwatch that utilizes physics, specifically resonance, to enhance timekeeping accuracy. Includes historical references from the 17th and 19th centuries and describes the mechanics of two balance wheels. Features images of the watch, key phrases, and a quote from François-Paul Journe.

And here’s where the physics becomes extraordinary.

Move your wrist and an ordinary mechanical oscillator can be disturbed. In the Résonance, Journe explains that the same disturbance can cause one balance to accelerate while the other slows by a corresponding amount.

Because the two are coupled through resonance, they progressively return toward their shared point of harmony.

The disturbance is therefore counteracted rather than simply being allowed to influence one isolated regulator. F.P. Journe

ONE BALANCE SPEEDS UP ↑

THE OTHER SLOWS DOWN ↓

RESONANCE PULLS THEM BACK TOGETHER ↔

And there is no conventional mechanical transmission connecting the two balances to make this synchronization happen. F.P. Journe describes the Chronomètre à Résonance as using the natural phenomenon of resonance without mechanical transmission between the oscillators. F.P. Journe

The mechanism isn’t fighting physics.

It’s using physics to fight disturbance.

💡 Did You Know?

François-Paul Journe didn’t invent the phenomenon of horological resonance itself.

The story reaches back centuries. Dutch scientist Christiaan Huygens observed synchronization between pendulum clocks in the 17th century, while Antide Janvier and Abraham-Louis Breguet later explored resonance in precision horology. Journe’s achievement was adapting the principle to the extraordinarily difficult environment of a wristwatch, where the mechanism is continually subjected to the movements of its wearer. F.P. Journe

Journe actually attempted a resonance pocket watch in 1983, but it didn’t perform to his expectations. According to F.P. Journe, another 15 years of experience and development were required before he could realize the concept successfully as a wristwatch. F.P. Journe

That makes the eventual watch even more fascinating.

The two balance wheels aren’t merely there because two oscillators look impressive through a caseback.

They are the experiment.

They are the physics.

They are the entire point.

⭐ Why It Matters

Watchmakers traditionally pursue precision by trying to isolate the regulating organ from disturbances or minimize their effects.

Journe pursued another possibility:

What if a second oscillator could help the first?

The resulting watch demonstrates something beautifully counterintuitive: two extremely delicate mechanical systems can interact so that the overall system becomes better able to cope with disturbances encountered on the wrist. F.P. Journe

It’s also worth avoiding the tempting description of one balance permanently “correcting” the other. F.P. Journe explains that each balance alternately acts as exciter and resonator. Neither is simply the master and neither is simply the slave. F.P. Journe

They influence each other.

TWO HEARTBEATS.

ONE FREQUENCY.

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Watch Fact of the Day: The Patek Calibre 89 Relied on a Computer-Aided Breakthrough

In a thrilling plot twist worthy of any sci-fi blockbuster, Patek Philippe decided to mix the old with the new while crafting the world’s most complicated watch for its 150th anniversary. The Calibre 89, featuring an astonishing 1,728 components and 33 complications, was partly designed with a computer—yes, you read that right! Who knew engineers could shake up Swiss watchmaking? With a team including a genius draughtswoman and some skeptical watchmakers, they created a pocket machine capable of knowing when Easter falls (no, it’s not just chocolate day). The lesson here? Computers can assist watchmakers, but only they can make time truly tick!

📅 Thursday, September 10, 2026

When Patek Philippe began planning an extraordinary watch for its 150th anniversary in 1989, Philippe Stern had an audacious objective: create a mechanical timepiece more complicated than anything the manufacture had built before.

But achieving it would require something decidedly unconventional in traditional Swiss watchmaking.

A computer.

Preliminary calculations for what became the Calibre 89 began in 1980. Philippe Stern entrusted the project to Jean-Pierre Musy, a 28-year-old engineer, rather than placing it exclusively in the hands of Patek’s veteran master watchmakers. It was a controversial decision. Stern later recalled that some traditional watchmakers doubted that a young engineer could successfully construct such an extraordinarily complicated watch. Hodinkee

The problem was staggering.

The finished Calibre 89 contained 1,728 components and incorporated 33 complications, all arranged inside an approximately 89 mm pocket-watch case. Its functions included a secular perpetual calendar, split-seconds chronograph, minute repeater, grande and petite sonnerie, alarm, equation of time, sunrise and sunset indications, sidereal time, celestial chart and even the date of Easter. Patek Philippe

Trying to determine how all those interacting mechanisms could coexist within one movement demanded a new approach.

Musy’s team combined traditional mechanical watchmaking with computer-assisted design and manufacturing techniques. One particularly fascinating contributor was draughtswoman Frédérique Zesiger, who worked directly with a computer to produce approximately 1,660 detailed component drawings. The system could calculate fabrication coordinates and recalculate positions as the movement’s incredibly dense architecture evolved. SJX Watches

This wasn’t replacing watchmakers with computers.

It was using computation to solve geometrical and organizational problems of a complexity that traditional methods made extraordinarily difficult—and then handing those solutions back to highly skilled craftspeople who still had to manufacture, finish, adjust and assemble the actual mechanical watch.

Master watchmaker Paul Buclin was responsible for assembly and finishing, while François Devaud helped coordinate the project. It became a remarkable collaboration between engineering, computer technology and traditional haute horlogerie. SJX Watches

Infographic about the Patek Philippe Calibre 89 watch, showcasing its history, innovative designs, and technological advancements in watchmaking.

After years of calculations, research and development, a working prototype was ready in July 1988. The yellow-gold Calibre 89 was completed in April 1989, in time to celebrate Patek Philippe’s 150th anniversary. Sothebys.com

The result was extraordinary.

At its introduction, the Calibre 89 became the world’s most complicated mechanical watch, a title it would retain for more than a quarter-century. Sothebys.com

💡 Did You Know?

The computer’s role went far beyond simply making prettier technical drawings.

The movement was constructed across four interconnected levels, and changes in one part of its architecture could affect coordinates elsewhere. Zesiger’s CAD system could recalculate those positions as the design evolved.

At one point, the team even lost the master assembly drawing for the secular calendar mechanism and reconstructed it using the approximately 1,660 individual component drawings that had survived. SJX Watches

Think about that:

1,728 COMPONENTS

33 COMPLICATIONS

1,660 TECHNICAL DRAWINGS

9 YEARS FROM INITIAL CALCULATIONS TO COMPLETION

All to produce one extraordinary mechanical machine. Sothebys.com

⭐ Why It Matters

The Calibre 89 demonstrated something enormously important at the end of the quartz crisis.

Technology didn’t have to replace mechanical watchmaking.

Technology could help mechanical watchmaking become even more ambitious.

Computers could perform calculations, manage geometries and assist manufacturing—but ultimately those digital instructions still had to become physical wheels, levers, springs, cams, pinions and screws assembled by human hands.

That makes the Calibre 89 a fascinating paradox:

One of the greatest achievements of traditional mechanical horology was made possible partly because Patek Philippe was willing to embrace new technology.

OLD WORLD CRAFTSMANSHIP.

NEW WORLD COMPUTATION.

ONE INCREDIBLE WATCH.

Category: Fun Quirk

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Watch Fact of the Day: The Mystery of Rolex’s Hidden Coronet on Sapphire Crystals

If you’re a Rolex fan, get ready to squint and play detective! At the 6 o’clock position on many modern Rolex watches lies a microscopic coronet—so tiny it’s like it’s playing hide and seek. This sneaky feature started showing up in the early 2000s and is a marvel of watchmaking rather than a mere scratch. But don’t get too excited; that little crown alone doesn’t guarantee authenticity. Counterfeiters have their fancy tricks, making even tiny etchings questionable. So, remember: whether the coronet is present or not, the full watch’s history matters—just like your Tinder profile, it’s all about the bigger picture!

📅 Monday, September 7, 2026

Look closely at the crystal of many modern Rolex watches and there’s a detail most people will never notice. At approximately the 6 o’clock position, just above the dial, Rolex places a microscopic version of its famous five-pointed coronet into the sapphire crystal—a feature collectors commonly call the LEC, or Laser-Etched Coronet. It is deliberately subtle enough to virtually disappear during normal wear.

The feature began appearing around the start of the 2000s, with collector references commonly placing its introduction around 2001 and its broader rollout over the next few years. That’s useful historical context because an authentic Rolex from the transitional period might not necessarily have one, while a replacement crystal fitted later could introduce the marking to an older watch.

And calling it an “etching” can actually undersell how interesting the process is. Rather than simply scratching a crown onto the surface, the genuine marking is formed from numerous microscopic points within the sapphire, allowing the exterior surfaces to remain smooth. Under magnification, the coronet therefore appears less like a printed logo and more like a tiny constellation of dots.

Finding it can become a game in itself. Looking straight down at the watch in ordinary lighting may reveal absolutely nothing. A loupe or magnifying glass combined with strong light hitting the crystal at an angle makes the coronet much easier to spot. Once the light catches those microscopic points correctly, the familiar crown suddenly appears floating above the 6 o’clock marker.

Infographic about Rolex's hidden coronet on sapphire crystals, highlighting its laser-etched detail at the 6 o'clock position, with various views including naked eye, magnified, and side-angle light.

The coronet was introduced as an additional anti-counterfeiting and authentication detail, but there’s an important collector warning: the LEC alone should never be treated as proof that a Rolex is genuine. Modern counterfeiters have attempted to reproduce the marking, and increasingly sophisticated replicas can imitate details that were once considered useful authenticity clues. Authentication needs to consider the entire watch rather than one microscopic crown.

There’s another wrinkle for collectors. Some Rolex service replacement crystals have been documented with an additional tiny “S” incorporated into the coronet, indicating a service crystal. That means finding a slightly different coronet configuration doesn’t automatically tell the whole story—the watch’s age and service history also matter.

💡 Did You Know?

The hidden coronet can be so difficult to see that being too obvious can itself be suspicious. A genuine LEC is intended to remain extremely discreet under ordinary viewing conditions; normally you’ll need careful lighting, magnification, or both before the tiny dotted crown resolves clearly.

Think of it as:

NAKED EYE → ALMOST NOTHING
ANGLED LIGHT → SOMETHING APPEARS
10× LOUPE → 👑

📖 Collector’s Note

The hidden crown is best thought of as one clue rather than an authenticity certificate.

An older genuine watch may legitimately lack it.
A service crystal may have one.
A counterfeit may attempt to reproduce one.

So:

CORONET PRESENT ≠ AUTOMATICALLY GENUINE

CORONET ABSENT ≠ AUTOMATICALLY FAKE

That nuance actually makes this Watch Fact better.

Category: Fun Quirk

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