Perpetual calendars are the authoritative complications of calendar watches. It's one of watchmaking’s true grand complications, and when Patek Philippe created the Ref. 3940 in the mid-80s, perpetual calendars were scarce. With it, a standard for all modern perpetual calendars was established.

The Patek Philippe 3940 Perpetual Calendar is understated both in styling and case-size. With its - by today's standards - modest size and svelte profile matched by a slim, micro-rotor movement, it's arguably one of most elegant offerings of the modern Patek Philippe era.

Representing the best of Swiss design, the movement is a technical feat. The ultra-thin, self-winding 240 Q base movement has been used by Patek Philippe since the 1970s, and continues to beat at the heart of their modern perpetual lines. Timeless, elegant and discontinued - the reference 3940 is an investment for life, to be worn - and appreciated, daily.