Patek Philippe Retrograde Perpetual Calendar diamonds the Reference 16753 has flashes

the Reference 16753 has flashes of gold on the bezel

it features an untouched silver sunburst "sigma" dial with white gold hour markers and intact Tritium luminescent indices and hands

sunburst blue dial with applied ‘Roman’ indices

Since the 1940s

The same imagery is mimicked on the caseback

Patek Philippe Retrograde Perpetual Calendar diamonds the Reference 16753 has flashesA perpetual calendar is like a small computer on your wrist. Think of it this way: Imagine a watch that keeps track of not only the time, but also the date, the day of the week, and the month, and also tells you whether its a leap year or not, and what the current phase of the moon is. Oh, and one more thing imagine it does all of this mechanically, using springs and gears, and that you only have to adjust it once every century or so. Crazy, right?