If you are researching the reference 25721, you are almost certainly trying to separate a genuine Audemars Piguet Royal Oak Offshore from a counterfeit. The 25721ST, launched in 1993 and nicknamed "The Beast," is one of the most replicated watch designs in the world. The tells that matter are not visible in a glossy listing photo: they live in lume application, bezel screw construction, movement architecture and the crispness of the engraving.
What is the Audemars Piguet Royal Oak Offshore 25721?
It is the original Offshore, released in 1993 as a larger, more aggressive evolution of Gérald Genta's 1972 Royal Oak, styled by Emmanuel Gueit. It introduced the Mega Tapisserie dial, a rubber-clad crown and chronograph pushers, and a bulky stainless-steel case that set the template for every Offshore that followed.
Key Features of a Genuine 25721
- Octagonal bezel with eight slotted hexagonal screws that thread into the case and can be removed with a proper tool, not molded decorative caps.
- Mega Tapisserie dial with sharply cut, uniform pyramid squares and cleanly printed minute track.
- Rubber-coated screw-down crown and chronograph pushers with correct proportions and a positive, mechanical click.
- Solid engraved caseback carrying the reference 25721ST, case number and "Royal Oak Offshore" in a consistent, deep engraving.
- Applied or printed AP monogram with clean edges and correct spacing under magnification.
- Calibre 2126, based on a Jaeger-LeCoultre ébauche with a Dubois-Dépraz chronograph module, finished with Geneva stripes and perlage.
- Calendar aperture with correctly aligned numerals and a matching date-wheel font.
- Case diameter of roughly 42 mm with a substantial, correctly radiused profile.
Materials and Specification Notes
The original reference is stainless steel with a sapphire crystal, a screw-down caseback and a rubber or leather strap on a signed tang buckle. Water resistance is rated for swimming, not diving, because of the chronograph module. Finishing is the giveaway: genuine cases show alternating polished and brushed surfaces with hard, straight transitions, while counterfeit cases usually appear slightly soft, with over-polished lugs and shallow, blurry engraving. Weight, the feel of the crown threads and the sound of the rotor are all noticeably different on copies.
Can a fake ever look convincing in photos?
Yes, which is why photos alone are unreliable. Ask for macro shots of the bezel screws, the dial squares, the caseback engraving and the movement under the caseback, then have the watch verified by Audemars Piguet or a qualified watchmaker before any money changes hands.
How should I buy one safely?
Buy genuine examples from an authorized dealer, a reputable auction house or a specialist with a documented service history, and confirm the return window and authenticity guarantee in writing before paying. A short inspection period plus a written refund policy is standard practice and your best protection against a misrepresented watch.