51-01

Hand-wound mechanical movement measuring 26.2 mm in diameter and 6.1 mm in height. It includes a screw balance with 18 weighted gold screws, a 21,600 A/h frequency, a 40-hour (+/- 5%) power reserve, a Breguet hairspring, and 21 jewels plus 2 diamonds. The movement displays central hours, minutes, and seconds with a perpetual calendar and a movement-side cantilevered minute tourbillon, featuring anglage, polished steel, screwed gold chatons, blued screws, polished gear profiles, and double solar-finished crown wheels.