Quick answer
The Audemars Piguet ref 15202 is a 39 mm Royal Oak Jumbo Extra-Thin. The case is 8.1 mm thick. It runs caliber 2121. Most fakes fail on three points: the case is too thick, the dial grid is printed or stamped flat, and the movement is a stock automatic with a quick-set date. Check those three first.
Case and profile
- Diameter is 39 mm. Thickness is 8.1 mm on the 15202ST.
- Copies often measure 10 mm to 12 mm at the caseback edge. A caliper on the mid-case settles it.
- The octagonal bezel holds eight hexagonal screws. On genuine watches the slot orientation differs from screw to screw. Many fakes align all eight slots.
- The bracelet is integrated. End links sit flush against the case and the bracelet tapers toward the clasp.
- Case edges carry a chamfer that runs from lug to lug. Copies leave this edge rounded.
Dial
The 15202 uses a Petite Tapisserie dial. The pattern is a field of small pyramids with flat tops raised above the base plate. Copies print the grid or stamp it level. Hold the watch at an angle. Real pyramids catch light on four faces and throw small shadows. The AP logo at 12 o'clock is applied metal, not ink. The date window sits at 3 o'clock.
One hard test is the date. The 15202 has no quick-set date. You set it by moving the hands past midnight and back again. A crown that flips the date at the first position points to a fake movement.
Caseback and engraving
Reference and serial numbers sit on the caseback. Genuine engraving is cut into the metal with sharp edges and even depth. Copies use laser etching, which leaves shallow lines with rounded edges. Fakes also reuse a small pool of serial numbers, so the same digits show up across many listings. Ask for a photo of the caseback and the movement before money changes hands.
Movement
Caliber 2121 is 3.05 mm thick. It runs at 19,800 vph, or 2.75 Hz, with a 40-hour power reserve and a 21K gold rotor. The base movement is the Jaeger-LeCoultre 920. The balance is free-sprung, with no regulator arm. A fake on a 28,800 vph movement ticks 8 times a second. The 2121 ticks 5.5 times a second. Look at the rotor material too. Gold on the 2121, plated brass or steel on copies.
Market context
AP discontinued the 15202 in 2022 and replaced it with the 16202 and caliber 7121. The 15202ST retailed for about $33,000 at the end of its run. Secondary prices sat above that figure for years. A listing that shows a 15202 at a few hundred dollars is not a 15202.
Checks in order
- Measure case thickness with a caliper.
- Look at the dial grid at an angle.
- Check slot orientation on the eight bezel screws.
- Test date setting with the crown.
- Ask for a movement photo and check the balance and rotor.