How to Spot a Fake Audemars Piguet
The fastest check is the caseback engraving paired with the movement. A genuine Audemars Piguet Royal Oak carries laser-engraved reference and case numbers that sit flush in the metal, an in-house caliber with the correct finishing visible through the sapphire back, and a bracelet whose screws seat with zero play. Fakes fail at least one of those three points, and most fail all three. Work through the steps below in order, and stop the moment something does not match a known reference photo.
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What You Need
- A 10x jeweler's loupe or a macro lens
- Digital calipers and a kitchen scale accurate to 0.1 g
- A UV flashlight
- Factory reference photos of the exact model and reference number
- Any box, papers, or service records the seller claims
Step-by-Step Authentication
- Photograph the watch from the front, back, and both bracelet sides in daylight, then open the factory image of the same reference side by side for a direct comparison.
- Inspect the caseback engraving under the loupe. Genuine AP engraving is shallow, crisp, and even, with sharp serif lettering; counterfeit engraving looks deep, soft, or filled with metal burrs.
- Read the case number and reference number out loud and compare them with the numbers printed on the warranty card and any service paperwork.
- Measure the case diameter and thickness with the calipers. A Royal Oak 15500ST measures 41 mm across and about 10.4 mm thick, and a fake is often 1 mm or more too thick.
- Weigh the watch. A genuine 15500ST on a full bracelet lands in the 170 g to 180 g range depending on links fitted, while plated brass or low-grade steel fakes come in noticeably lighter.
- Study the dial pattern. The Grande Tapisserie squares on a genuine dial are machined with sharp raised edges and a matte top surface; fakes show a shallow, printed, or plastic-looking grid.
- Check the date window. The aperture sits square to the 3 o'clock marker, the font is thin and sharp, and the date sits flush with no white border or shadow.
- Examine the hands under magnification. Genuine hands have polished bevels along every edge and lume that fills the frame evenly with no overflow onto the metal.
- Run the UV light over the dial and hands. Lume should glow evenly and fade at the same rate across all markers; patchy or blotchy glow points to a relumed or aftermarket dial.
- Turn the bracelet over and check each screw head. Genuine screws sit flush in a countersunk hole with a clean slot, and no screw protrudes past the link surface.
- Open and close the clasp several times. The AP folding clasp snaps with a firm, even resistance, and the logo stamp is deep and centered, not etched or lasered onto a flat plate.
- Look through the sapphire caseback at the movement. A caliber 4302 shows Geneva stripes on the bridges, perlage on the base plate, a gold rotor with the family crest, and a balance running at 28,800 vph, so the second hand should sweep in eight visible beats per second.
- Check the winding feel and crown threads. The crown should screw down smoothly in about two turns with no grinding, and the crown logo should be sharp and centered.
- Request an Extract from the Archives from Audemars Piguet, or have a qualified watchmaker open the case and confirm the movement number against the case number.
- Walk away if the price sits far below market, the seller refuses an inspection, or the serial numbers do not repeat across the watch, the card, and the archive record.
Red Flags That End the Inspection
- Sapphire crystal that scratches with a fingernail test or shows a purple tint under UV
- Caseback screws that are slotted on both sides instead of the correct configuration
- A rotor that spins freely with a cheap rattle when the watch is tilted
- Stretched or misaligned gaps between bracelet links
- Paperwork printed on glossy stock with mismatched fonts or a blurry logo
When to Get Professional Help
Any watch above a few thousand dollars deserves a hands-on inspection by a watchmaker who services Audemars Piguet. Ask for the case to be opened, the movement number photographed, and the beat rate measured on a timegrapher. That single appointment settles more questions than an hour of photo comparison, and it protects you if the seller turns out to be wrong about the watch.