Patek Philippe Perpetual Calendar Strap vintage Heuer stopwatch from the

vintage Heuer stopwatch from the late 1970s

and dauphine hands

blued sweep hands in the twin chronograph registers

day and month apertures below the 12:00 position

Patek Philippe Perpetual Calendar Strap vintage Heuer stopwatch from theA 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