Short answer

A fake Audemars Piguet 26470O is a copy of the 42 mm Royal Oak Offshore chronograph. The name is a warning by itself. Audemars Piguet does not sell a watch under the reference 26470O. Full references add case material letters. Steel is 26470ST. Rose gold is 26470OR. Titanium is 26470IO. A listing that stops at 26470O leaves out the case material. That is common with copies.

1. Read the full reference

A real reference has three blocks. Example: 26470ST.OO.A027CA.01. The first block is the model. The second block is the strap or bracelet code. The third block is the dial and strap color. Fakes list 26470O or 26470 and stop. Ask the seller for a photo of the caseback. The full reference is engraved on the back and printed on the warranty card.

2. Compare the price with real listings

Steel 26470ST watches trade above $20,000 on the secondary market. Most sit between $22,000 and $30,000. Copies sell for $200 to $800. A steel chronograph at $900 is not a bargain. It is a copy. Gold 26470OR models cost more than steel. Any price below $15,000 for a complete 26470 needs a clear reason, such as a missing box or a heavy polish.

3. Look at the movement through the caseback

The 26470ST has a sapphire display back. The real movement is calibre 3126/3840. It uses the in-house 3120 base and a chronograph module. A real rotor is 22k gold. The bridges show Geneva stripes, circular graining and polished bevels. Fake movements use printed decoration, a steel rotor or a Seagull ST19 base. Look at the balance wheel. A real free-sprung balance has no regulator index. Most copies use a regulated balance with a visible index arm.

4. Count the bezel screws

The Royal Oak Offshore bezel holds 8 hex screws. Real screws sit flush with the bezel. The hex socket is cut clean and deep. Copies show soft hex edges, heads that sit proud, or flat-head screws. Check the slots. A real slot has a sharp edge and a uniform width.

5. Check the dial texture

The dial uses the Mega Tapisserie pattern. The squares are cut and raised, not printed. Under a loupe the top of each square shows fine milling lines. The tachy scale print is crisp at the edges. The date window sits at 3 o'clock. The date font is thin. A copy shows thick font, a printed pattern or a date window with a rough bevel.

6. Inspect the caseback engraving

Real engraving is deep and sharp. Royal Oak Offshore sits above the reference. The serial number and the case number are separate engravings. Both match the warranty card. Copies use shallow laser marks and a serial that does not match any card.

7. Test the crown and pushers

The crown carries the AP monogram. Stamping is deep and sharp. Chronograph pushers have firm travel and a clean start and stop. Copies have mushy pushers and shallow engraving.

8. Ask for the box, card and service record

A complete set raises the price and lowers risk. A real 26470ST ships with a wooden box, a warranty card and a hang tag. The serial on the card matches the caseback. Fakes ship in generic boxes with blank cards. A service record from an AP service center adds proof.

9. Know the law

Sale of counterfeit watches is illegal in the United States under 18 U.S.C. 2320. U.S. Customs and Border Protection can seize shipments. A buyer has no warranty and no service path through Audemars Piguet.

Quick checklist

  • Full reference includes ST, OR or IO
  • Price above $20,000 for steel
  • Sapphire back with calibre 3126/3840
  • 22k gold rotor
  • 8 flush hex screws
  • Raised Mega Tapisserie squares
  • Deep caseback engraving
  • Serial matches the card
  • Firm pushers