Patek Philippe Perpetual Calendar – 18K Yellow Gold
Reference: 3941J
Condition: Pre-Owned
Specifications
The Patek Philippe Ref. 3941J is an exceptionally rare variation of one of the manufacture's most important modern perpetual calendars. Introduced alongside the legendary Ref. 3940 family in the mid-1980s, the 3941 was distinguished by its sapphire exhibition case back, allowing the owner to view the ultra-thin Caliber 240 Q and its micro-rotor. Patek Philippe eventually incorporated display-back options into the 3940 itself, resulting in the 3941 being discontinued around 1990 after a remarkably short production period. Christie's
Despite measuring only 36mm, the 3941J houses a full perpetual calendar capable of mechanically accounting for months of different lengths as well as leap years. Three beautifully balanced subsidiary displays communicate the day, date, month, moonphase, leap-year cycle, and 24-hour indication. The restrained silvered dial and slim 18K yellow gold case allow an extraordinary amount of mechanical complexity to remain visually elegant. Sothebys.com
At its heart is the legendary Patek Philippe Caliber 240 Q, an ultra-thin automatic perpetual-calendar movement built around a recessed 22K gold micro-rotor. The movement's architecture allowed Patek Philippe to produce a remarkably slim perpetual calendar while preserving the classical proportions expected of a traditional dress watch. The sapphire back of the 3941 was specifically created in response to clients who wanted to see this movement—making the exposed Caliber 240 Q an essential part of the reference's identity.
Paired here with a black leather strap and 18K yellow gold Patek Philippe tang buckle, the 3941J is an exceptionally traditional presentation of an increasingly important collector reference. Its short production run, exhibition back, classic 36mm proportions, precious-metal construction, and celebrated micro-rotor perpetual-calendar movement distinguish the 3941 from the considerably more familiar Ref. 3940.
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