Patek Philippe Perpetual Calendar 5327J Reverso UG buckle and period-correct box

UG buckle and period-correct box — you'd be hard-pressed to find all that information presented in a nicer package than this

a nearly flawless dial

As (arguably) the first self-winding chronograph movement (hence its name)

Where the 16803 enjoyed a short production run

Patek Philippe Perpetual Calendar 5327J Reverso UG buckle and period-correct boxA 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