Quick answer
The fastest tell on a Royal Oak 16402 is the bezel hardware. On a genuine watch all eight hexagonal screws are functional, slotted, and set flush with a crisp bevel. Most fakes use stamped studs, screws that cannot turn, or slot angles cut with rounded edges. After the screws, work through the case profile, dial texture, caseback engraving, bracelet, and movement in that order. Any single mismatch is enough to walk away.
how to tell fake audemars piguet royal oak 16402
What you need
- A 10x loupe
- A bright light you can angle across the surface
- A wooden toothpick for probing screw slots
- The correct reference specifications for the 16402 from an official source
- A scale accurate to 0.1 g if you plan to weigh the watch
Inspection procedure
- Test the bezel screws. Press a toothpick into each slot. The slot should have real depth and the screw should be a separate part seated in a counterbore. A soft, shallow slot or a head that flexes means stamped metal. Look at the eight slots as a group: they should show consistent width and clean edges.
- Read the case profile. The 16402 sits thin on the wrist, with a sharp break between the brushed top surfaces and the polished flank bevel. Run a fingernail along that line. On a fake the bevel is wide and soft, the case is thicker than the reference, and the brushing runs in the wrong direction on the bezel top.
- Light the dial from the side. Genuine tapisserie squares are raised and cut with sharp walls, so raking light throws hard shadows across the grid. Fake dials show a shallow stamped pattern or a printed grid that stays flat under the same light.
- Inspect the printing. Under the loupe, the brand name and the line below it should be thin, even, and clean at the edges. Fakes use heavier strokes, rounded serifs, and letters that crowd each other.
- Check the date and hands. The aperture should be square to the dial, centered in its window, and the date font should match the reference. Hands must be faceted with polished bevels and a flat, even fill.
- Study the caseback. Reference and serial numbers are engraved to a consistent depth with correct spacing. Fakes show shallow lasering, uneven digit shapes, and numbers that sit off center.
- Work down the bracelet. Links taper toward the clasp, each link carries a polished bevel on its edge, and no link rocks or rattles. The clasp engraving should be crisp with a sharp AP monogram, not a blurry etch.
- Look at the movement if the back is transparent. Geneva stripes, circular graining, polished screw heads, and clean engraving on the balance cock are the baseline. Printed stripes and rough edges are a fail. If the caseback is solid, treat the movement as unverified.
- Weigh and handle the watch. A 16402 in steel feels dense for its size. Light weight plus loose end links points to a base watch with a thin case.
Stops that end the inspection
- Screws that will not turn or show no slot depth
- Printed dial grid instead of raised tapisserie
- Reference and serial engravings in different fonts or depths
- Caseback screws with the wrong head shape
- A bracelet that rattles at the case joint
Paperwork and verification
Match the serial on the caseback to the serial on the warranty card, invoice, and service papers. Fonts and spacing must be identical across all of them. Photograph the caseback and dial in daylight, then send the images to Audemars Piguet or an authorized service center for a written opinion before you pay. Auction houses and established dealers also publish condition notes that confirm serial ranges, so compare against those records when the seller cannot supply an extract from the archives.