The fake Patek Philippe Advanced Research 5550P is a replica of a 2011 platinum perpetual calendar that Patek Philippe limited to 300 pieces. No replica reproduces the genuine watch's Silinvar technology, so a fake 5550P copies the look, the dial layout and the case markings while using an ordinary third party movement. Buyers should treat it as a cosmetic homage rather than a functional copy.
What is the genuine Patek Philippe 5550P?
The reference 5550P-001 arrived in 2011 as part of Patek Philippe's Advanced Research series, which dates back to the 2005 ref. 5250. It pairs a 37 mm platinum case with a perpetual calendar and the Silinvar oscillator group developed with the Swiss research center CSEM.
Patek made 300 examples. The movement, calibre 240 Q SI, adds the Pulsomax escapement, the Spiromax balance spring and a Gyromax Si balance wheel. Those silicon based parts reduce friction and lubrication needs, which is the entire point of the Advanced Research program.
What does a fake 5550P actually copy?
Most replicas copy the 37 mm case shape, the dial layout and the engraved caseback. The goal is a convincing wrist shot, not a working Patek mechanism.
- Case and lugs: 316L stainless steel, sometimes rhodium plated to imitate the cool white tone of platinum.
- Dial: printed subdials at 3, 6 and 9 o'clock, a moonphase aperture, day and night display and leap year window.
- Movement: a Miyota 9015, an ETA clone or a Chinese automatic, usually hidden behind a decorated rotor plate.
- Caseback: sapphire crystal with laser etched text and a medallion style rotor that mimics the Patek Calatrava cross.
How do you tell a fake 5550P from the real watch?
- Silinvar parts: genuine Pulsomax and Spiromax components have a matte grey silicon appearance. Replicas use polished steel or cheap alloys.
- Calendar function: on most fakes the subdials are decorative. A real perpetual calendar tracks leap years and never needs correction until 2100.
- Case finishing: genuine platinum shows crisp bevels and a Pt950 hallmark. Replicas show soft edges, uneven brushing and laser engraving that lacks depth.
- Weight: platinum is far denser than steel. A fake 5550P feels light for its size on the wrist and in the hand.
Does the fake perpetual calendar work?
Nearly all 5550P replicas show day, date, month and moonphase as printed decoration or a basic date wheel. A true perpetual calendar with correct leap year tracking does not exist in the replica market at this price point. If a seller claims full calendar function, ask for a video of the date jumping from February 28 to March 1.
What should you pay for a 5550P replica?
Prices usually fall between $250 and $700 depending on case material, dial quality and movement. Gold plated or solid gold replicas run higher but rarely exceed $1,200, and they still lack the genuine Silinvar parts. A genuine 5550P trades in the six figure range at auction because only 300 were made.
Is a fake 5550P worth buying?
Buy it only as a visual tribute to a landmark Patek Philippe reference. There is no Patek warranty, no factory service and no meaningful resale value. A buyer who wants a real working perpetual calendar should look at an entry level genuine calendar watch instead.