Patek Philippe 3940J — A Timeless Perpetual Calendar Classic
The Patek Philippe Reference 3940J is a landmark among perpetual calendar wristwatches, combining understated elegance, technical sophistication, and collectible appeal. Launched in 1985 and produced until 2007, the 3940J remains one of Patek Philippe’s most revered complications of the modern era.
Design & Heritage
Crafted in 18 k yellow gold with a classic 36 mm case, the 3940J wears with effortless refinement. The dial displays a full perpetual calendar — day, date, month, leap year, and moon phase — powered by the ultra-thin Calibre 240Q movement with a peripheral micro-rotor. Its proportions and layout reflect Patek Philippe’s philosophy of timeless, functional elegance.
Collectors particularly prize early-series examples for their distinctive dial details and solid casebacks; later versions introduced subtle refinements and optional display casebacks that reveal the exquisitely finished movement.
Why It Matters
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Historic significance: Released when many watchmakers stepped back from high complications, the 3940 reaffirmed Patek Philippe’s commitment to traditional haute horlogerie.
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Movement innovation: The Calibre 240Q is celebrated as one of the first ultra-thin automatic perpetual calendar movements with a micro-rotor — a hallmark of mechanical ingenuity.
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Collector appeal: With a relatively limited production run and strong provenance, the 3940J remains highly sought after on the secondary market, especially in yellow gold with original box and papers.
Style & Wearability
As a dress watch, the 3940J strikes a rare balance — formal yet approachable, elegant without pretension. Whether worn with business attire or evening wear, it maintains a presence that is both distinguished and discreet.
Here, our bespoke brown glossy alligator strap pairs precisely and beautifully with the 3940J. Our craftsmanship and subtle taste elevates the watch, allowing the wearer to fully enjoy the timepiece with a strap of quality to match.