Royal Oak OffShore 25721 Chronograph Stainless Steel / Blue

In Context

At 42 mm it is sized to the current mainstream: 40 mm is the median across every watch measured in this catalogue. The case back is closed, so the movement stays out of sight, and the sapphire crystal will resist everything short of deliberate abuse. 100 m is genuine swimming resistance — more than the shape of this watch suggests it would need.

The movement winds itself from the motion of your wrist. 45 hours of reserve carries it overnight, but not through a weekend in a drawer. At 21,600 vph the seconds hand advances 6 times a second, the slower and more audible rate of an older design.

25721.ST.O.1000ST.01 stands on its own in this catalogue — no other reference here shares its base number. It pairs a blue dial with a stainless steel case. Beyond the time it carries a chronograph.

Self-winding movement with chronograph complication, first introduced in 1985 [1983]; JLC 889 + Dubois Depraz module.

1 other watch in the library runs the Audemars Piguet AP 2126 / 2840.

Audemars Piguet

Royal Oak OffShore 25721 Chronograph Stainless Steel / Blue

25721ST.OO.1000ST.01 · 42 mm