A fake Audemars Piguet Royal Oak Offshore 26403 shows itself in four places: the bezel screws, the dial texture, the chronograph pushers, and the markings on the back. Real Offshore cases use eight hexagonal screws with a single slot, and those slots line up with the case edges. Copies get the screw shape wrong or leave the slots pointed in random directions.

What is the Royal Oak Offshore 26403?

The 26403 belongs to the Royal Oak Offshore line, the bigger and sportier branch of the Royal Oak family. Audemars Piguet built the Offshore for diving, racing, and daily wear, so the case runs thick and the chronograph pushers sit on a rubber-coated crown guard.

Reference numbers in this family cover several dial colors, metals, and strap options. Two watches can share the 26403 prefix and still differ in case material, dial finish, and bracelet type. Match the full reference code, not just the first five digits.

How do you spot a fake 26403? Start with four checks

Work through these in order. Each one takes under a minute with the watch in hand or a sharp photo on screen.

• Bezel screws: eight hex heads, one slot each, slots aimed at the case center.
• Dial: a sharp Méga Tapisserie grid with even squares and no blur.
• Pushers: firm clicks, no wobble, and a seal that meets the case with no gap.
• Caseback: clean engraving, correct reference, and a movement that looks finished, not painted.

Bezel screws and the octagonal bezel

Real screws sit flush in a countersunk hole. On copies the screws often stand proud, spin with a fingernail, or use a Phillips head. Look at the slot direction too. Genuine watches align each slot with the case edge or the center, and the pattern repeats around all eight.

The bezel itself should have crisp polished bevels. A fake bezel looks dull at the edges or shows tool marks from a cheap polish job.

Dial: Méga Tapisserie and the date window

The Méga Tapisserie pattern is a raised grid of squares. On a real dial each square has a flat top and a sharp edge. Copies show soft, rounded squares or a printed pattern that looks flat under a loupe.

Check the date window as well. It should cut clean lines and sit centered in the aperture. Many fakes show a date that sits low, or a cyclops that distorts the number.

Crown, pushers, and chronograph feel

Push the chronograph start button. A real 26403 starts with a short, firm click. Copies feel mushy or need a hard press. The reset should snap back to zero in one motion.

The crown guard on an Offshore wraps the crown in rubber or metal. Look for a clean seam between the guard and the case. A gap or a loose fit points to a copy.

Caseback, movement, and engraving

Engraving on a real caseback cuts deep and reads clean at an angle. Copies use laser etching that looks shallow and gray under light. The reference number, serial, and gold hallmarks (if the case is gold) should all match the paperwork.

If the watch has a display back, study the movement. Rotor finishing, jewel settings, and screw heads separate a real caliber from a decorated clone. A painted or sticker-covered movement is a fake.

Serial numbers, papers, and price signals

A Royal Oak Offshore 26403 sells for tens of thousands of dollars on the used market. Any offer far below that range is a fake or a stolen watch. There is no bargain on a real one.

Serial numbers and reference codes must match the warranty card and the caseback. AP keeps service records, so a boutique or an authorized dealer can confirm a match. A seller who blocks a verification check is a seller to walk away from.

Boxes and papers get copied too. Paper quality, font weight, and card edges all matter. Compare them to photos from a known genuine set.

Fake, first copy, and super clone: what is the difference?

Buyers use these words in loose ways, so here is a working guide.

• Cheap fake: low price, wrong screw slots, flat dial print, quartz or rough automatic movement.
• First copy: a mid-tier replica with the right case shape and dial layout. Good for daily wear, easy to spot up close.
• Super clone: a high-grade replica that copies the movement layout and case finishing. Costs more, still not genuine.

None of these watches come from Audemars Piguet. They carry no factory warranty and no service history. Buy them as fashion pieces, not as investments.

Frequently asked questions

Is the Royal Oak Offshore 26403 faked often?

Yes. The Offshore line is one of the most copied watch families in the world, along with the Rolex Submariner and the Patek Philippe Nautilus. The 26403 and its close siblings show up on resale sites, social media, and street markets.

How much does a fake 26403 cost?

Cheap fakes start under $100. First copy versions run from about $150 to $400. High-grade super clones can reach $600 or more. Price alone does not prove quality, so check the four tells above.

Can a jeweler tell a first copy from a real one?

Yes, most watchmakers can spot a replica in seconds once the caseback comes off. Exterior checks (screws, dial, pushers) also give it away. If you plan to resell, be honest about what you own.

Do fake 26403 watches keep time?

Some do, for a while. Cheap movements drift and lose power fast. Better replicas use cloned automatic movements that hold time within a few seconds a day, but service parts are hard to find.

Bottom line

Eight hex screws with aligned slots, a crisp Méga Tapisserie dial, firm pushers, and deep caseback engraving are the fastest ways to judge a Royal Oak Offshore 26403. Price and paperwork close the case. If any one check fails, treat the watch as a replica.