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18K gold Patek Philippe Ref. 3940 perpetual calendar. Among important and collectible complicated wristwatches, this rare and highly desirable second-series example from 1993 perfectly represents the golden era of neo-vintage Patek Philippe. Once very much undervalued, the Ref. 3940 is now universally recognized by collectors as one of the finest perpetual calendars, with demand continuing to rise as the market fully appreciates its historical significance, timeless proportions, and understated sophistication. Housed in the perfectly balanced 36 mm case, the Ref. 3940 embodies everything a great complicated watch should be: elegant, discreet, technically extraordinary, and exceptionally comfortable on the wrist. Its slim profile and sober design allow the perpetual calendar complication to be displayed with unmatched harmony and refinement.
This example has been well preserved over the years, retaining strong proportions with only light polishing, visible hallmarks, and a flawless original dial. The watch has also just undergone a full service by Patek Philippe only a few months ago, making it an outstanding collector’s example ready to be enjoyed immediately.
At its heart beats the legendary self-winding calibre 240Q movement, celebrated as one of the most elegant and technically refined perpetual calendar movements.
Originally sold in Germany, the watch is accompanied by its original papers stamped August 1993, the second solid caseback, Patek Philippe service invoice dated January 2026, original Patek Philippe crocodile strap, and original 18K gold buckle.
The Ref. 3940 is no longer simply an important Patek Philippe — it has become a cornerstone reference for serious collectors of neo-vintage horology. An essential watch for any world-class collection.