Answer first
A fake Audemars Piguet 5402 is a copy of the 1972 Royal Oak Jumbo. A real 5402ST is 39 mm wide, about 7 mm thick, and runs Caliber 2121. Most fakes fail on thickness, dial texture, bezel screws, and caseback engraving. The caseback is solid, so a watchmaker must open the watch to check the movement.
audemars piguet 5402 replica watch
What the 5402 is
Audemars Piguet launched the Royal Oak in 1972. The first model was the 5402ST. Gérald Genta designed the case. The watch has an octagonal bezel with eight hexagonal screws, an integrated steel bracelet, and a thin automatic movement. The dial uses the Petite Tapisserie pattern: a grid of small raised pyramids. The 5402 has a date at 3 o'clock and no seconds hand.
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What fakes get wrong
Case size and thickness
A real 5402 is 39 mm wide and about 7 mm thick. Many fakes measure 41 mm or more. Most fakes are 9 mm to 11 mm thick. The extra thickness comes from a standard movement and a thicker caseback. Put the watch on a caliper. A 5402 that stands tall over the wrist is a fake.
Dial texture
The Petite Tapisserie is not a flat print. The squares are raised pyramids with sharp edges and even spacing. Fake dials use a stamped pattern with soft edges. Some fakes use a flat grid. Under a loupe, check the space between the date window and the tapisserie. Real dials keep the pattern clean at the cutout.
Bezel screws
The 5402 has eight hexagonal screws. Each screw sits in a recess. The slot on top takes a special tool. Real screws have a crisp slot and sit flush. Fake screws sit high, sit at odd angles, or have no working slot. Check the gap between the screw head and the bezel.
Caseback
Real 5402 casebacks carry the words Royal Oak, the reference, and a serial number. The engraving is deep and sharp. Fake engraving looks shallow, laser-cut, or too large. Check the font of the numbers. Compare the position of the text to a known 5402 photo.
Movement
Caliber 2121 is an ultra-thin automatic. It is about 3 mm thick. Fakes use ETA 2892, Sellita, or Chinese automatic movements. These movements are thicker. A watchmaker can open the caseback and check the rotor, bridges, and stamp. No stamp means no proof.
Quick checks
- Measure width and thickness with a caliper. 39 mm and about 7 mm are the targets.
- Look at the dial with a loupe. The tapisserie squares must be raised and sharp.
- Turn each bezel screw. Real screws have a cut slot. Fake screws may be solid caps.
- Read the caseback text. Check font, depth, and number placement.
- Ask a watchmaker to open the watch and identify the movement.
Limits
Photos can hide thickness and dial texture. A caseback photo can hide engraving depth. A real 5402 from 1972 has wear, service parts, and dial changes. A fake can pass a photo check. Only a hands-on check with tools gives a firm answer.