Patek Philippe Perpetual Calendar Moonphase Chronograph 'Salmon' patek philippe grand complications This guaranteed an unprecedented interchangeability

This guaranteed an unprecedented interchangeability in their parts

notable for the tachymeter scale on the outer rim of the dial

This particular watch offers a bit more flair for when your average steel Zenith Daytona just doesn't cut it

the Calatrava has become a byword for a simple

Patek Philippe Perpetual Calendar Moonphase Chronograph 'Salmon' patek philippe grand complications This guaranteed an unprecedented interchangeabilityA 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