Logical One

Reference: MON00164-YG

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Limited Edition: five pieces
Case: 18-karat yellow gold
Size: 43mm
Movement: hand-wound manufacture Logical One caliber 
Power Reserve: approximately 46 hours
Dial: black enamel
Water Resistance: 30m
Caseback: sapphire crystal
Strap/Bracelet: leather

Originally purchased in 2020, this Romain Gauthier Logical One is in excellent overall condition. The watch comes as a full set with its original box and papers. Goldsmith & Complications guarantees the watch’s authenticity. All of our pre-owned watches are covered by the manufacturer’s warranty. Learn more about our pre-owned watches.


Romain Gauthier’s modern interpretation of a chain-and-fusee constant-force mechanism is showcased in the Logical One, his award-winning mechanical masterpiece. This invention includes a friction-minimizing chain made with ruby links and – in a world-first – an ergonomic pusher that’s used to wind the exquisitely finished movement. Only five pieces were made of this yellow-gold incarnation.