In order to accommodate months with 31, 30 and 28 days, and february 29 in leap years, a movement must have a mechanical “memory” of four years – or 1,461 days. This function requires a highly sophisticated mechanism, based on a complex system of levers and cams pivoting around their axes. This is a domain in which Patek Philippe has repeatedly leveraged its long-standing competence.
Perpetual calendar. Moon phases. Day, date, month, leap year and 24-hour indication by hands. Bezel set with 68 diamonds (~0.68 ct). Prong buckle set with 27 diamonds (~0.2 ct). Dial: Silvery-white opaline, gold applied hour markers. Straps: shiny alligator with square scales, hand-stitched, mink gray (originally fitted) and royal purple (additional strap). Prong buckle set with 27 diamonds (~0.2 ct). Case: rose gold. Interchangeable full back and sapphire-crystal case back. Water resistant to 30 m. Case diameter: 35.1 mm. Height: 8.7 mm.
Perpetual calendar. Day, date, month, leap year and 24-hour indication by hands. Moon phases. Diameter: 27.5 mm. Height: 3.88 mm. Parts: 275. Bridges: 8. Jewels: 27. Power reserve: min. 38 hours, max. 48 hours. 22K gold off-center mini-rotor. Balance: Gyromax®. Vibrations/hour: 21 600 (3 Hz). Balance spring: Spiromax®. Hallmark: Patek Philippe Seal. Patent: CH 595 653.