Patek Philippe Retrograde Perpetual Calendar Dirty Dozen a lovely salmon dial with

a lovely salmon dial with factory applied diamond indices and a matching handset

This particular Reference 810 also features the desirable AOPA logo on the dial

the Chronostop Driver’s watch is undeniably charming

fixed tachymeter bezel and a clean but sporty dial

Another plus is the presence of tritium on some examples

Patek Philippe Retrograde Perpetual Calendar Dirty Dozen a lovely salmon dial withA 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, 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? Patek has