Vaucher Manufacture Fleurier VMF 5401

VMF 5401 is an ultra-thin automatic movement with micro-rotor, manufactured by Vaucher Manufacture Fleurier. It measures 2.6mm thick with a 30mm diameter, beats at 21,600 vph, and delivers a 50-hour power reserve from its twin barrels. The variable inertia balance features gold inertia blocks with Atokalpa optimization. The caliber remains in production and supplies movements to Hermès, Richard Mille, and Parmigiani Fleurier, with variants including sub-seconds, big date, and openwork versions.