52-01

Hand-wound mechanical movement with a 26.2 mm diameter and 4.3 mm height. It features a screw balance with 18 weighted gold screws, a 28,800 A/h rate, a 40-hour (+/- 5%) power reserve, a flat hairspring, 18 jewels, and Incabloc shock protection. The exquisitely finished caliber includes hours and minutes, anglage, polished steel parts, blued screws, screwed gold chatons, polished gear profiles, double solar-finished crown wheels, swan-neck fine adjustment, and a fully hand-engraved balance cock and three-quarter plate.