📅 Wednesday, November 4, 2026
In 1965, Swiss brand Certina released the Biostar, the world’s first and only wristwatch designed to track a person’s daily physical, emotional, and mental biorhythms. To set the multi-colored complication, the wearer had to synchronize internal mechanical discs to their exact date of birth. While biorhythm theory ultimately proved pseudoscientific, the Biostar remains one of the quirkiest mechanical feats of the 20th century.
Category: Fun Quirk
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