A fake Patek Philippe perpetual calendar 5320G is a replica of the 40 mm white gold perpetual calendar that Patek Philippe introduced in 2017. The better builds copy the case profile, the cream lacquer dial, the applied gold numerals and the calendar layout with day, date, month and moon phase. Budget builds look convincing in a listing photo and weak in the hand, so the deciding factors are case weight, dial finishing, aperture alignment and whether the calendar really advances.

What the genuine 5320G sets as the benchmark

The real watch is a white gold perpetual calendar with a vintage inspired case, so any honest comparison starts with materials and proportions rather than the logo on the dial.

  • 40 mm white gold case with stepped lugs borrowed from mid century Patek designs
  • Cream lacquer dial with applied gold Arabic numerals and a printed minute track
  • Caliber 324 S Q automatic with a perpetual calendar module
  • Sapphire crystal on the front and a display back, so movement finishing is meant to be seen
  • Day, date, month, moon phase and small auxiliary indications for the longer calendar cycles

Where replica 5320G builds usually fall short

  • Case material and heft. Gold has a density steel cannot match. A plated steel case is lighter and often a fraction thicker through the profile.
  • Lug geometry. The stepped lug is the hardest case element to copy. Look for soft edges, uneven steps and polishing that bleeds into brushed surfaces.
  • Dial finish. Genuine cream lacquer has depth. Replicas often use flat off white paint or a heavy gloss that shifts yellow under warm light.
  • Apertures. Day and month windows on fakes can sit deep, have rough inner edges or show misaligned discs.
  • Moon phase disc. The moon and stars are printed rather than applied, so shading looks flat and stars can be oversized.
  • Movement finishing. Engraving, Geneva stripes and rotor decoration are visible through the back and are usually the giveaway.
  • Crown, clasp and strap. Winding feel, crown size and the fit of the deployant clasp all separate tiers.

Check the calendar functions before you buy

A perpetual calendar is the whole point of the 5320G, so ask for a short video that shows the functions working, not just a photo set.

  1. Advance the day, date and month and watch whether the discs jump or drag.
  2. Confirm the month advances correctly at the end of a short month if the movement allows manual correction.
  3. Check the moon phase disc rotates when the crown is turned.
  4. Ask whether the leap year and day and night indications are functional or decorative.
  5. Confirm the quick set positions work without forcing the crown.

Movement options in 5320G replicas

There are three rough groups. Entry builds pair a basic automatic movement with a decorative calendar plate, and some functions do not move. Mid tier builds use a clone style movement with a working calendar module, though the month and leap year setup may need manual correction. Higher tier builds add better finishing, engraved bridges and a rotor that looks close to the original under a loupe. A true perpetual calendar module is the hardest part to reproduce, so treat any claim that the watch never needs adjusting with caution.

Measurements and inspection points

Ask for caliper readings of diameter, thickness and lug to lug, plus the weight on a scale. A one millimetre difference in thickness changes how the watch sits on the wrist and how the case sides catch light. Then inspect the dial under magnification: numeral font and thickness, print alignment against the minute track, the squareness of the aperture windows and the clarity of the sapphire crystal.

Questions to ask a seller

  • Which movement is inside, and which calendar functions actually work?
  • Is the case solid gold, gold plated or stainless steel, and what is the measured weight?
  • Can you send a video of the date, month and moon phase advancing?
  • Is the crystal sapphire or mineral, and does it have an anti reflective coating?
  • What is the service position if the calendar module stops?

Care and realistic expectations

Replica calendar modules carry more parts than a simple three hand watch, so avoid setting the calendar near midnight and avoid rapid date changes. Keep the watch away from strong magnets and have it checked if the discs start lagging. Remember that a replica is not a Patek Philippe, has no manufacturer service support and should never be sold or represented as a genuine watch.