The Patek Philippe ref. 3940 is one of the most recognizable perpetual calendar layouts ever produced, and this tribute build recreates that experience with a cloned perpetual calendar movement. Instead of an auction-house bill, you get the same balanced sub-dial arrangement, the same slim dress-watch profile, and a calendar module that genuinely tracks leap years.
Key Features
- Cloned perpetual calendar movement with day, date, month, moonphase and 24-hour sub-dials
- Leap-year indicator that advances automatically across the four-year cycle
- Slim case profile, roughly 36 mm wide and about 9 mm thick
- Silvered opaline-style dial with applied baton markers and dauphine hands
- Sapphire crystal up front plus a transparent display caseback
- Decorated caliber with Cotes de Geneve striping, perlage and blued screws
- Automatic winding with a power reserve of roughly 38 to 42 hours
- Fitted on a stitched leather strap with a matching-tone pin buckle
Materials and Specifications
The case is finished in polished stainless steel with a slim silhouette that slips easily under a cuff. The dial carries a silvered opaline finish, printed sub-dial scales and applied markers, all protected by a domed sapphire crystal. Inside, the cloned perpetual calendar movement runs on an automatic winding system with hand-applied decoration across the bridges and rotor. The strap is genuine leather on a signed-style buckle. Water resistance is light, so treat it as splash and rain resistant only and keep it away from pools and showers.
patek philippe perpetual calendar 3940 clone movement
Shipping and Returns
Orders leave the warehouse within one to two business days in discreet, protective packaging, with tracking sent as soon as the parcel moves. If the watch is not right for you, returns are accepted inside the standard window provided the piece comes back unworn with its strap, tags and presentation box intact. Contact support and we will guide you through an exchange or refund.
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Is the 3940 clone movement a real perpetual calendar?
Yes. The module mechanically accounts for 28, 30 and 31-day months and only needs a manual correction once every four years, exactly like the original complication.
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How close is the clone movement to the original ref. 3940?
Visually it is very close, with sub-dial positions, case proportions and dial furniture that follow the vintage reference. Internally it uses a modern cloned caliber rather than the original 240 Q architecture, which keeps servicing straightforward.
Will I need to reset the calendar often?
No. Keep it wound, or resting on a winder, and the calendar holds its place through short months and leap years. Only a long stop will require a reset.