The quick answer
No Audemars Piguet reference ends in "26470O" by itself. That string is nearly always a chopped version of a longer number: either the rose gold 26470OR, or the middle segment of a steel reference written out in full, like 26470ST.OO.A027CA.01. So a search for a fake Audemars Piguet 26470O means a counterfeit Royal Oak Offshore chronograph from the 26470 family. The genuine watch is 42mm, wears a Méga Tapisserie dial, has three counters at 12, 6 and 9 with the date at 3, and runs the caliber 3126/3840 behind a sapphire caseback. Modern replicas nail the silhouette at arm's length. They give themselves up at the movement, the case thickness and the finishing, and all three are things you can check without an loupe if you know where to look.
What the genuine 26470 is
- 42mm case in stainless steel or 18k gold, around 14mm thick
- Automatic caliber 3126/3840, roughly 50 hours of power reserve, 21,600 vibrations per hour
- Chronograph with three subdials at 12, 6 and 9, date window at 3
- Water resistance to 100m, sapphire crystal front and back
- Solid 22k gold oscillating weight, visible through the caseback
That sapphire back matters more than any other detail. The movement is not hidden, so a counterfeiter has to fake the finishing, not just the face. Most cannot.
Where fakes give themselves up
Case depth and side profile
Replica 26470s almost always run thick, often by a full millimeter or more. On the wrist that reads as a chunky, slab-sided case instead of the tapered profile the Offshore is known for. If you can measure it, measure it. Calipers on the case flanks beat any photo comparison. Gold references should also feel heavy in the hand. A plated steel case wears light, and the difference is obvious once you have held a real one.
Dial and Méga Tapisserie
The tapisserie squares on the original are cut with crisp bevels and catch light along their edges. Fakes are usually molded or printed flat, so the pattern looks greasy under a lamp rather than sharp. Look at the printed signature, the applied AP monogram and the subdial rings. Sloppy spacing, thick lettering and counters that sit slightly off center are common. Hands are another giveaway: the genuine hands are faceted and polished on every side, while replica hands are often flat stamped metal with a dull edge.
The movement behind the glass
This is the hardest thing to fake. A genuine 3126/3840 shows Geneva stripes, polished bevels, blued or polished screws and a heavy gold rotor. Replica movements are usually dressed-up versions of a generic chronograph base, sometimes with a thin decorative plate screwed on top. The rotor is a dead giveaway, since counterfeiters rarely spend real gold on a part most buyers never inspect. Shake the watch gently. A7750-based fakes have a noisy, whirring rotor; the real thing is quieter and smoother.
Caseback engraving, strap and clasp
Look at the reference number, case number and movement number engraved on the back. Genuine engraving is cut deep and consistent. Replica engraving is often laser-etched, shallow and inconsistent in font weight. On the strap, check the stitching and the rubber texture, and on the clasp check that the AP logo is crisp and the folding mechanism snaps with weight rather than rattling. Push the chronograph buttons. Genuine pushers take a firm, short press and the hands jump cleanly to zero when you reset.
What high-end replicas actually get right
Be honest about this: top-tier replicas get the case shape, bezel screws, dial color and overall proportions close enough that a non-enthusiast will not spot them across a table. What they do not get right is the inside of the watch, the weight of a gold case, and the small finishing touches on the dial furniture. If a seller claims a replica is "indistinguishable even to a jeweler," that claim is a sales tactic, not a fact. Authentication always comes down to the movement and the paperwork.
Checklist before you trust a 26470
- Measure the case thickness with calipers and compare it to the stated reference specs.
- Inspect the movement through the caseback for a gold rotor and real hand finishing.
- Read the engraved numbers on the caseback and confirm they match the paperwork.
- Check dial texture under angled light for beveled tapisserie squares.
- Press the pushers and reset the chronograph; note how the hands return to zero.
- Weigh the watch in your hand if it is a gold reference.
- Have a watchmaker with AP experience open the case for a final look.
Getting a real answer
An AP boutique or service center is the only source that can authenticate with certainty, and an independent watchmaker with access to genuine parts is a close second. Auction specialists are useful too, especially on older Offshore references. Bring the original warranty card (the International Warranty booklet from that era), service receipts and the box if you have them, because provenance carries as much weight as the watch itself. One more thing worth knowing: trafficking in counterfeit watches is illegal in the United States, and customs can seize shipments, so the "cheap alternative" route carries real risk of losing both the money and the watch.