The perpetual calendar is the complication collectors respect most, and the reference 3940 is the layout they picture when they close their eyes: three small dials, a moonphase at six, and a slim case that slides under a cuff. This replica captures that classic arrangement in a wearable 36mm format, so you get the vintage dress-watch look on the wrist without the auction-house price tag. It is a display piece built for people who love the design and know exactly what they are buying.
Key Features
- Three-register perpetual calendar layout: day and 24-hour indicator at nine, month and leap-year window at three, date and moonphase at six
- Automatic movement with a micro-rotor design, visible through a sapphire display caseback
- Anti-reflective sapphire crystal over the dial
- Slim dress-watch profile that rests flat and fits neatly under a shirt cuff
- Faceted applied hour markers with leaf-style hands
- Leather strap with an alligator-grain finish and a matching pin buckle
- Offered in steel-tone, gold-tone, and rose-tone finishes
- Arrives in a protective travel case
Materials and Specifications
The case is machined from polished 316L stainless steel, with a gold-tone or rose-tone finish on the plated versions, and measures roughly 36mm across by about 10mm thick. The front and back are both sapphire crystal, so the movement and its decorated winding mass stay on show. The calendar discs follow the standard 31-day cycle and are advanced with the pushers set into the side of the case; the moonphase disc runs on a 29.5-day cycle. Water resistance is splash and rain resistant only, so keep it away from swimming, showers, and hot water.
Shipping and Returns
Orders ship within one to two business days in plain, discreet packaging with tracking provided at dispatch. If the watch is not right for you, return it within 30 days in unworn condition with the strap and case for a full refund or exchange.
Is this a genuine Patek Philippe?
No. This is an independent replica and is not made by, affiliated with, or endorsed by Patek Philippe.
Will the calendar need adjusting?
Yes. Like any mechanical calendar it should be reset after the watch has been left unworn, using the side pushers. Avoid pressing them between 9pm and 3am while the date mechanism is engaged.
How should I care for it?
Wipe the case with a soft cloth, keep it away from water and magnets, and wind or wear it regularly so the calendar discs stay accurate.