Patek Philippe Perpetual Calendar

A 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 it’s 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?

Perpetual calendars are Patek Philippe’s speciality — it’s been making them in series since the 1940s. This particular quantieme perpetual, a Reference 5140P-017 dating to circa 2010s, is a true beauty. Housed in a 37mm 18K platinum case, it features a sapphire crystal, sapphire exhibition caseback, platinum signed crown, and a beautiful, gray dial with applied indices and a matching dauphine handset. Powered by the Cal. 240 Q automatic movement with micro-rotor, it’s absolutely a piece of horological art — the type of timepiece that gets passed down through the generations.

It would be enough to enjoy this innovative wristwatch on its own, but this particular timepiece also comes with its inner and outer boxes.

Any old wrist watch can tell the time.