Patek Philippe Retrograde Perpetual Calendar Motorsport 18k yellow gold oval case

18k yellow gold oval case with a fantastic

Over the three decades of its production

Powered by the Selitta 220-1 automatic movement

they only got better and better

a subsidiary seconds register

Patek Philippe Retrograde Perpetual Calendar Motorsport 18k yellow gold oval caseA perpetual calendar is like a tiny mechanical computer for the wrist. Think about everything involved in displaying the correct date. The watch must know whether a month has 30 or 31 days. It must account for February, including leap years. It must track the day of the week, the month, and often the phases of the moon. Now imagine accomplishing all of that not with software or electronics, but with springs, levers, gears, and cams working together in