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.
Ultra-thin mechanical self-winding movement.
Day, date, month, leap year and 24-hour indication by hands.
Dial: ebony black opaline dial, gold applied Breguet numerals.
Alligator strap with square scales, hand-stitched, shiny black.
Case: white gold.
Interchangeable full back and sapphire-crystal case back.
Water resistant to 30 m.
Case dimensions: 37 × 44.6 mm.
Height: 8.48 mm.