If you are searching for a fake Audemars Piguet Royal Oak Chronograph 25940, the decisive test is the movement. The genuine watch runs Audemars Piguet calibre 2385, a column-wheel chronograph built on the Frédéric Piguet 1185 base. Case proportions, dial texture, bezel screws and bracelet finishing all matter, but none of them separate an original 25940 from a first-copy listing as fast as the calibre does. This guide covers the reference itself, the checks that hold up under a loupe, and the wording sellers use.
What the reference 25940 actually is
The 25940 sits in the first generation of Royal Oak chronographs. It arrived in the late 1990s and stayed in the catalog into the 2000s, and collectors call it the Kasparov for a straightforward reason: Garry Kasparov was photographed wearing one. It carries the classic Royal Oak case with an octagonal bezel held by eight hexagonal screws, an integrated bracelet and a tapisserie dial, in a compact case of roughly 39 mm. Because it predates the modern 26331 and 26240 generations, its dial layout and case proportions do not match current chronographs, and that gap is where most replica listings fall apart.
Check one: the movement
- Genuine: calibre 2385, a column-wheel chronograph based on the Frédéric Piguet 1185, with striped bridges, circular graining and polished bevels visible on the movement.
- Replica: a Valjoux 7750 derivative, a quartz movement, or a low-grade automatic. The tell is the pusher action and rotor noise more than the dial.
Ask for a photograph of the movement with the caseback off, or through a display back if the example has one. A refusal to show the movement is a red flag. If the seller cannot show a column wheel, stop there.
Check two: case, bezel and crown
On a genuine 25940 the eight bezel screws sit flush inside countersunk recesses, cut cleanly and threaded into the case rather than glued on as decoration. Bevels between brushed and polished surfaces stay crisp, and the octagonal bezel geometry is sharp where the fakes go soft. Screw slot alignment is not uniform on genuine examples, so treat perfectly mirrored slots as a question worth asking, never as proof. Crown and pushers should feel firm and screw down with clean threads.
- Genuine: even brushing, crisp anglage, screws seated at the same depth, no tool marks around the openings.
- Replica: uneven screw heights, rounded case flanks, polishing that bleeds across the edges, and a thicker case than the reference should have.
Check three: dial and tapisserie
The genuine tapisserie grid is machined into the dial blank, so the squares have uniform depth and a matte finish, with snailed rings on the counters. Replica dials usually print or stamp a shallower grid, and the printing itself gives the game away: font weight, spacing and the Swiss Made signature at 6 o'clock are rarely right. Hold the watch at an angle and look for depth in the pattern.
Check four: bracelet, clasp and engraving
The integrated bracelet tapers into the case with brushed link tops and polished bevel edges, and the clasp carries correct engraving rather than laser-etched filler. Caseback engraving is the other place replicas fail: reference and serial fonts, depth of cut and spacing should match what Audemars Piguet used for this period. Photograph the caseback in raking light and compare the letterforms, not just the numbers.
What sellers mean by 'first copy'
Wording does a lot of work in this market. First copy, mirror and 1:1 usually mean the top tier of replica, and listings borrow the reference number, the Kasparov nickname and the look of documentation. None of that is evidence of anything. Newly made watches that carry the Audemars Piguet name and logo are counterfeit goods, and trafficking in them is a federal offense in the United States. If you want a legitimate watch, the reference number is what leads you to auction records and dealer stock. If you want to authenticate one, the same term leads you to the movement specification that settles the question.
How to verify before you buy
- Get clear photographs of the movement, the caseback and the clasp.
- Compare the reference and serial against period engraving examples.
- Request service records or an Extract from the Archives, which Audemars Piguet issues for historic references.
- Confirm case dimensions and overall feel against published specifications for the reference.
- Have it inspected by a watchmaker who has handled Royal Oaks, not a general jeweler.
Bottom line
The 25940 is a first-generation Royal Oak chronograph with a specific engine inside it. Replicas catch the silhouette and lose the calibre, the finishing and the engraving. Decide what you are actually shopping for, then use the movement as the gate, because a dial is far easier to copy than a column wheel.