Patek Philippe Reference 3940J Full Set, Manufactured in 1995

**Patek Philippe Reference 3940J Full Set, Manufactured in 1995**

This is a pre-owned, full-set listing (accompanied by its original presentation box and papers) for a Patek Philippe reference 3940J in 18k yellow gold, manufactured in 1995. The reference 3940 was introduced in 1985 and remained in production until 2006, serving as the successor to the legendary references 3448 and 3450 . It is widely regarded as the archetypal modern Patek Philippe perpetual calendar and was, at the time of its release, the thinnest automatic perpetual calendar wristwatch available .

**Case & Dial**
The watch features a round case measuring 36 mm in diameter and approximately 8.8 mm in thickness, crafted from 18k yellow gold . Examples produced around 1995 generally belong to the second series (produced circa 1988–1998), which is distinguished by the inclusion of a sapphire crystal display back in addition to the solid snap-on case back . The dial is silvered with applied baton hour markers. The perpetual calendar displays are arranged across three subsidiary dials: the day and 24-hour indication at 9 o'clock, the month and leap year indication at 3 o'clock, and the date integrated with the moon phase aperture at 6 o'clock. This layout, with its perfect symmetry, is a hallmark of the reference .

**Movement & Functions**
Powering the watch is Patek Philippe caliber 240 Q, a self-winding automatic movement with 27 jewels and the Geneva Seal . The movement utilizes a 22k gold micro-rotor, which contributes to its exceptionally slim profile of just 2.4 mm for the base caliber . Functions include hours, minutes, perpetual calendar (day, date, month, leap year), moon phase, and a 24-hour indication . The perpetual calendar mechanism is designed to account for the varying lengths of months and the leap year cycle, requiring adjustment only in the year 2100.

**Condition & Accessories**
As a full-set offering, this piece is accompanied by its original Patek Philippe presentation box and papers. Depending on the specific example, accessories for a 1995-sold reference 3940J may include a Certificate of Origin and an Extract from the Archives confirming the date of manufacture and sale . The watch is fitted to an alligator leather strap with an 18k yellow gold Patek Philippe buckle . As a pre-owned piece, it may show signs of wear consistent with normal use; the condition of the case, dial, and movement should be verified against the specific listing.