Patek Philippe Perpetual Calendar Chronograph 5270G Tray unlike the complete Arabic markings

unlike the complete Arabic markings on the later and much more common Mark VI versions

warranty card from Tourneau dated to 1999

but that doesn't diminish our appreciation for this killer timepiece

moonphase at 6 o’clock and date around the perimeter of the dial

Patek Philippe Perpetual Calendar Chronograph 5270G Tray unlike the complete Arabic markingsA 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?