Ferdinand Berthoud refines the flyback chronograph with mechanical precision

The Chronomètre FB 2TV.1 refines one of watchmaking’s most demanding complications: the flyback function, whereby the seconds hand snaps instantaneously to zero and restarts its count without hesitation. Here, Chronométrie Ferdinand Berthoud has integrated the mechanism within the crown itself, a solution that required months of research to achieve without introducing vibration or imprecision into the movement.

What distinguishes this approach is not merely the integration but the engineering beneath it. A specially shaped cam, forged from polished brass and visible through the sapphire caseback, orchestrates the flyback action with mechanical purity. Pink jewels punctuate the movement like rubies set in precious metal, their function both decorative and functional: friction reduction at the pivot points where the cam engages the seconds wheel and the return mechanism. Slotted screws hold the steel components in place, each one finishing the careful geometry that separates precision from mere complication.

The movement sits revealed behind transparent sapphire, a decision that transforms a mechanical achievement into a spectacle. The interaction between the specially profiled cam and the levers that govern the flyback becomes legible to the wearer, the entire apparatus accomplishing its return to zero in a fraction of a second, invisible to the eye yet entirely comprehensible to those who understand the craft. This is the essence of horological refinement: not concealment of complexity but its clarification through flawless execution.

Imagery courtesy of Chronométrie Ferdinand Berthoud (@ferdinandberthoud).