Patek Philippe Retrograde Perpetual Calendar Motorsport Over the three decades of

Over the three decades of its production

we've gone on about how much we love mid-century chronographs

Its 40mm polished stainless steel case features a pair of barrel pushers and a large screw down crown protected by a set of crown guards

a subsidiary seconds register

then we don't know what is

Patek Philippe Retrograde Perpetual Calendar Motorsport Over the three decades ofA 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