Romain Gauthier Logical One

Romain Gauthier's Logical One is a manual-winding, in-house movement featuring a chain-and-fusee constant force mechanism. Introduced in 2013, it won the GPHG Best Men's Complication award that year. The movement replaces the traditional chain-and-fusee with a snail cam-driven constant force system, delivering steady power to the escapement throughout the winding cycle. It remains in production and serves as the basis for several of the brand's flagship timepieces.