What is a fake Audemars Piguet 26400RO?

A fake Audemars Piguet 26400RO is a counterfeit copy of the Royal Oak Offshore Chronograph reference 26400RO.OO.A002CA.01. The genuine watch has a 44 mm rose gold case, a black ceramic bezel, and an AP Caliber 3126/3840 automatic chronograph movement. Fakes use steel, gold plating, or low-karat gold. They often use a generic chronograph movement.

Genuine specs to compare

  • Reference: 26400RO.OO.A002CA.01
  • Case: 18k rose gold, 44 mm
  • Bezel: black ceramic
  • Water resistance: 100 m
  • Movement: AP 3126/3840, automatic, 50-hour power reserve
  • Frequency: 21,600 vph (3 Hz)
  • Functions: hours, minutes, small seconds, chronograph, date

Common tells on a fake 26400RO

  • Weight. Genuine rose gold is heavy. A plated steel fake weighs less. But some fakes use tungsten. Weight alone is not proof.
  • Caseback. Engraving depth, font, and serial layout differ. Genuine has proper AP logo and reference numbers. Fakes often have shallow laser etching.
  • Movement. Genuine 3126/3840 has a gold rotor, Geneva stripes, perlage, and correct chronograph layout. Fakes use a 7750 or clone with wrong subdial spacing.
  • Bezel screws. Genuine screws are white gold, sit flush, and have a specific slot shape. Fake screws may be steel, uneven, or too bright.
  • Dial. Genuine dial has precise tapisserie pattern, correct date font, and clean subdial rings. Fakes show misaligned markers, wrong date wheel, or thick printing.
  • Crown and pushers. Genuine 26400RO has black ceramic crown and pushers. Fakes may use PVD-coated steel.

How to verify a 26400RO

  1. Check reference number. 26400RO.OO.A002CA.01 is rose gold with black dial and black ceramic bezel. Other 26400 references use different metals.
  2. Inspect the movement through the sapphire caseback. The AP 3126/3840 has a specific layout.
  3. Measure the case. Genuine is 44 mm wide and about 14.4 mm thick.
  4. Test water resistance. Fakes often fail 100 m.
  5. Ask for service records from Audemars Piguet.

Limits of identification

No single tell proves a watch is fake. High-end counterfeiters copy weight, dial, and caseback. A watchmaker or AP service center can confirm authenticity. Online forums and market listings are not proof. If you cannot inspect the movement, treat the watch as unverified.