How to spot a fake
Royal Oak Chronograph

Study the three chronograph subdials together with the dial. On a genuine Royal Oak Chronograph the sub-registers sit in a clean 3-6-9 layout with the date at 4:30, they are correctly proportioned and evenly spaced, and each one carries the same Grande Tapisserie waffle inside it. The chronograph is a real column-wheel mechanical, so the pushers give a crisp, deliberate start-stop-reset. Fakes betray themselves three ways at once: the subdial layout is off (many replicas use a Valjoux 7750 clone with registers at 12-6-9 and a date at 3), the tapisserie is flat and printed, and the guts are quartz or a cheap automatic clone rather than AP's finished movement.

It depends on the reference. For roughly two decades the steel Royal Oak Chronograph, including the 26331ST made from 2017 to 2022, used the self-winding calibre 2385, a column-wheel chronograph based on the Frederic Piguet 1185 with around a 40-hour power reserve. In 2022 the reference 26240 introduced the first in-house movement in a steel Royal Oak Chronograph, the flyback calibre 4401, with a column wheel, vertical clutch and a 70-hour power reserve. A generic movement, a quartz module, or rotor engraving that does not match the reference is a definitive fake.

Genuine references use a tri-compax 3-6-9 layout with running seconds at 6 o'clock and a date window at 4:30. The exact assignment of the two other counters varies by reference: the 26331 places a 30-minute counter at 3 and a 12-hour counter at 9, while the newer 26240 places the 12-hour counter at 3 and the 30-minute counter at 9 with more evenly sized registers. Either way the subdials are symmetric, centered on the correct axes and carry matching tapisserie. Randomly sized, off-center or wrongly positioned registers, especially a 12-6-9 layout with a date at 3, point to a 7750-based clone.

The current reference 26240 has a sapphire display caseback, so you can inspect the finished in-house calibre 4401 and its solid gold rotor directly. Many earlier chronograph references, including the 26331, typically use a solid metal caseback, which means the movement can only be examined once a watchmaker opens the watch. Know which your reference should have: a display back where there should be solid metal, or a solid back where the sapphire should be, is itself a warning sign.

Grande Tapisserie is the large-square guilloche waffle pattern used on most 41mm Royal Oak Chronograph dials, and the same pattern is repeated inside the subdials. It is cut into a solid metal dial by dedicated guilloche machinery, so every tiny pyramid is the same height with razor-sharp ridges that flash uniformly under angled light. Tilt the watch under a lamp: genuine tapisserie is deep, three-dimensional and even edge to edge, including inside the sub-registers. Fakes stamp or print a shallow imitation that looks flat and muddy and often loses the pattern inside the small subdials.

A serial or reference number alone cannot prove authenticity, because fakes copy real numbers. The reference and serial are engraved between the lugs or on the caseback, and genuine engraving is deep, crisp and evenly spaced. The most reliable path is an AP Extract from the Archives or authentication through an AP boutique, backed by the original certificate and box. Treat number checks as one signal among many, alongside the subdial layout, the tapisserie, the bezel screws and the movement.

A price far below market is the single biggest red flag. Genuine steel Royal Oak Chronographs trade well above retail, so a bargain from an unverified seller almost always signals a replica or a franken-watch built from mixed parts. Combine the price check with the subdial alignment test, the Grande Tapisserie depth, the bezel screws and, where the reference allows, the movement through the caseback before you commit.

Yes. Upload clear photos of the dial and subdials, the case profile with the pushers, the bezel screws, the bracelet and clasp, and the caseback. Our AI checks the subdial layout and proportions, the tapisserie depth and regularity, screw alignment, finishing transitions, engraving fonts and movement details against genuine references and returns an authenticity verdict with a full breakdown in about 30 seconds. For a watch of this value, pair the scan with an in-person inspection by a certified watchmaker.