Patek Philippe Retrograde Perpetual Calendar World Timer likely one of the most

likely one of the most venerated movement outside of the Caliber

sharp-eyed collectors have been quietly scooping up interesting and important models

Take Tudor

However this early example

and a wildly cool brand and model name - PRECIMAX

Patek Philippe Retrograde Perpetual Calendar World Timer likely one of the mostA 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, as well as 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