This Iconic Perpetual Yellow Gold Perpetual Patek Philippe Ref# 3940J-001 is accompanied with Patek Philippe service papers, Extract from the Archives, instruction manual, second case back, deployant buckle setting pin, and automatic box. This 3940J-001 was recently serviced at Patek Philippe in 2019 and comes with a 2 year warranty.

The 3940J-001 perpetual calendar automatic watch, features a 36 mm case. This is a yellow gold example with a silver dial and yellow gold deployant buckle. Functions include hours, minutes, seconds, day, date, month, moon phase, leap year indicator and 24 hour indicator.

Patek Philippes reference 3940 is undeniably one of the most iconic perpetual calendar wristwatches available to collectors today, and followed a prestigious line of classic models: the reference 1526, the first serially produced perpetual calendar watch from 1941, the 2497 the first perpetual calendar with center seconds from the 1950s, the reference 3448 released in 1962 as the first automatic perpetual calendar and in 1981 the 3450 Patek Philippes first model to feature a leap year indicator. The 3940 was released in 1985 as a replacement to the reference 3450 with a newly designed modern case, which was less angular than its predecessors. Powered by what was then the all-new, ultra-thin calibre 240, Patek Philippes first movement to use a micro-rotor, it enabled an elegant and very thin case that fit tightly to the wrist. The reference 3940 was a smashing success, in production for over two decades, where it appealed to a new generation of enthusiasts who wanted to advance beyond their fathers timepieces.