Romain Gauthier Logical One MON00122 18k Red Gold Black Enamel Dial 43mm Limited 5 Pieces (2021) Full Set

The Logical One is the timepiece that established Romain Gauthier as one of the most distinctive names in independent watchmaking. It received the Best Men’s Complication award at the 2013 Grand Prix d’Horlogerie de Genève. At its heart is an innovative interpretation of the traditional chain-and-fusee constant-force mechanism. Instead of a conventional conical fusee, the movement uses a slowly rotating snail cam positioned on the same level as the mainspring barrel, delivering consistent energy through a short, direct chain. The chain features steel links fitted with synthetic ruby rollers to reduce friction, with the intricate mechanism displayed prominently on the dial.

Reference MON00122 is housed in a 43mm 18k red gold case and is limited to just five pieces. Its oven-fired black enamel subdials, set on a gold base, display the off-centre hours and minutes alongside small seconds. The exposed ruby chain, snail cam and distinctive Romain Gauthier balance wheel with curved arms and calibrated eccentric weights create a striking mechanical presentation. The power reserve indicator is positioned on the reverse of the watch.

The in-house, multi-patented constant-force movement is manually wound using an ergonomic pusher integrated into the caseband at 9 o’clock, offering approximately 46 hours of power reserve. Its mainspring barrel incorporates synthetic sapphire plates, while the triangular pallet lever, circular-armed gear wheels and S-slot screws reflect the brand’s distinctive technical approach. Each movement receives up to 90 hours of hand-finishing, including polished rounded bevels and jewel countersinks, which can be admired through the sapphire display caseback.

This 2021 example is offered in good pre-owned condition with its full set of box and papers. Combining an award-winning complication, innovative constant-force engineering and exceptional independent craftsmanship, the Romain Gauthier Logical One MON00122 is a remarkable addition to any serious watch collection. Every timepiece at SHK Watches is carefully authenticated and inspected before sale.