The reference 25721ST is the original Audemars Piguet Royal Oak Offshore, introduced in 1993 as a larger, sportier reading of the Royal Oak. It uses a 42 mm stainless steel case about 15 mm thick, which is why collectors call it "The Beast" at a time when most luxury watches measured near 36 mm. Every Offshore made since traces back to this reference, and it is also the Offshore that gets copied most often.
Key specifications
- Case: stainless steel, 42 mm wide, roughly 15 mm thick, brushed top surfaces with polished bevels
- Bezel: octagonal, eight visible hex-head screws
- Crown and pushers: rubber coated
- Dial: Mega Tapisserie grid with applied luminous markers and three subdials
- Movement: automatic modular chronograph built on a Jaeger-LeCoultre base
- Caseback: solid, engraved with reference and edition details
- Strap: rubber with a signed folding clasp, also sold on a steel bracelet
- Production: 1993 into the early 2000s
How to inspect a 25721ST
- Measure the case. Width should read 42 mm at the bezel and thickness about 15 mm from caseback to crystal.
- Examine the eight bezel screws. They are hex-head fasteners that thread into the case and sit in recessed openings. Decorative studs or slots set flush with the bezel are a warning sign.
- Study the dial. The Mega Tapisserie grid has large, deep squares with sharp edges, and the printing on the subdials is thin and clean.
- Work the crown and pushers. The rubber coating should be bonded to the metal underneath, and the pushers should travel with a firm click and snap the chronograph hand back to zero in one motion.
- Read the caseback. Engraving should be crisp, with a consistent font and the reference and serial numbers in the correct positions.
- Check the strap and clasp. Original rubber straps carry molded markings on the underside, and the folding clasp is signed.
- Compare the watch against archive photos of confirmed examples before you decide.
Where replica 25721ST watches fall short
Copies of the 25721ST give themselves away in the hand, not in a phone photo.
- Dial texture is shallower and the grid squares are uneven
- Crown and pusher coating is hard plastic rather than bonded rubber
- Case thickness runs 1 mm to 2 mm off in either direction
- Pusher action feels mushy and the chronograph hand hesitates on reset
- Caseback engraving uses the wrong font weight and spacing
- The movement is a generic chronograph with a decorated rotor rather than a modular caliber on a Jaeger-LeCoultre base
What drives value on the original
Early production, an original dial and hands, box and papers, and the correct strap and buckle all push value up. Service dials, replaced bezels and over-polished cases pull it down. The 2018 anniversary re-edition is a separate reference with its own number and should not be confused with the original.
Before you commit
- Confirm the reference number on the caseback and between the lugs
- Ask for movement photos, not just wrist shots
- Budget for a service if the watch has no recent history
- Get the seller's return terms in writing