Answer first
A fake Audemars Piguet Royal Oak yellow gold is a replica of the 39mm Jumbo ref. 15202BA or 16202BA. The genuine watch uses an 18k yellow gold case and bracelet. It weighs about 150 to 160 grams. Most fakes use gold-plated steel or brass. They weigh 120 to 145 grams. Genuine retail prices run from about $60,000 to $75,000. Fakes sell for $300 to $1,200. Weight, movement, and dial texture separate the two.
Case and bracelet
- 18k yellow gold density is 15.5 g/cm³. Steel is 7.8 g/cm³. A gold-plated steel case cannot match the heft of solid gold.
- Genuine 15202BA case measures 39mm across and 8.1mm thick. Many fakes measure 39.5mm or 9mm thick.
- Genuine bracelet links have rounded edges and tight tolerances. Fakes show gaps at the clasp and rough screw slots.
- Hallmarks sit on the caseback and clasp. Real marks read "Au750" or "750" with sharp borders. Fake marks look shallow or blurry.
Dial
The Tapisserie pattern on a real Royal Oak is stamped into a brass dial. The squares have a matte finish and a slight tilt. Fake dials often use a flat print or a sticker. The color looks orange or green under direct light. Genuine yellow gold dials have a warm, even tone. Date windows on fakes sit too far left or right. The date font is too bold or too thin.
Movement
Ref. 15202BA uses caliber 2121. Ref. 16202BA uses caliber 7121. Both are extra-thin automatic movements with a gold rotor. A real 2121 beats at 19,800 vph. Most fakes use a Miyota 9015 or a clone. Those beat at 28,800 vph. A timegrapher shows the beat rate in vibrations per hour. A 28,800 vph reading on a Jumbo is a fake. The rotor on a real AP has Geneva stripes and a hand-finished edge. Fake rotors show machine marks or no decoration.
Legal status in the US
US law bans trafficking in counterfeit goods under 18 U.S.C. § 2320. Customs and Border Protection can seize fake watches at import. Buying a fake for personal use is not a federal crime in most cases. Selling or shipping one is. Penalties include fines and prison time.
What to check
- Weigh the watch on a gram scale. Below 145g points to a fake.
- Use a 10x loupe on the caseback. Look at the font depth and the serial number.
- Ask for a timegrapher photo. 19,800 vph fits a real 2121.
- Check the clasp screws. Real screws sit flush and take a 1.4mm driver. Fake screws strip.
No single test proves a watch is real. A jeweler with AP parts can open the case and inspect the movement. Paperwork from Audemars Piguet adds proof. A watch without papers needs a service quote from an authorized dealer.