Royal Oak 15500 Stainless Steel / Grey

In Context

At 41 mm it is sized to the current mainstream: 40 mm is the median across every watch measured in this catalogue. At 10.4 mm thick it is about average for a modern wristwatch. The case back is open, so the movement is visible without taking the watch apart, and the sapphire crystal will resist everything short of deliberate abuse. 50 m covers rain and hand-washing comfortably; it is not a watch to swim in.

The movement winds itself from the motion of your wrist. 70 hours of reserve is enough to set it down on Friday evening and find it still running on Monday. At 28,800 vph the seconds hand advances 8 times a second.

15500ST.OO.1220ST.02 stands on its own in this catalogue — no other reference here shares its base number. It pairs a grey guilloche dial with a stainless steel case. Introduced in 2019.

The 4302 is the in-house automatic Audemars Piguet introduced in 2019 for the 41 mm Royal Oak and CODE 11.59, replacing the 3120 after sixteen years. It powers 55 watches in this library, every one 41 mm. It is a larger movement than the 3120, at 32 mm across and 4.8 mm high, and a faster one: the beat rises from 21,600 to 28,800 vph, the reserve from 60 to 70 hours, and the date is quick-set with a stop-seconds function the 3120 lacked. The 22-carat gold rotor is skeletonised and rides on ball bearings, and the movement has 32 jewels. It launched in the Royal Oak 15500 and the CODE 11.59 Selfwinding on the same day, and the 15510 of 2022 carries it with the 50th-anniversary rotor. In the library it sits under 30 [Royal Oak](/brands/audemars-piguet/royal-oak) references, the 15500 and 15510 in steel, pink gold and white gold, and 25 [CODE 11.59](/brands/audemars-piguet/code-11-59) Selfwinding references. Two are limited editions. The [3120](/calibers/audemars-piguet-ap-3120) is the movement it replaced, the [4401](/calibers/audemars-piguet-ap-4401) the chronograph of the same generation, and the [5900](/calibers/audemars-piguet-ap-5900) the smaller movement for the 37 mm and 38 mm cases.

54 other watches in the library run the Audemars Piguet AP 4302.

Audemars Piguet

Royal Oak Selfwinding 41 White Gold - Diamond / Blue Sapphire / 50th Anniversary

15512BC.ZZ.1322BC.01 · 41 mm

Audemars Piguet

Royal Oak 155020 Pink Gold / Orange Sapphire

15502OR.ZZ.1222OR.01 · 41 mm

Audemars Piguet

CODE 11.59 Automatic White Gold / Burgundy

15210BC.OO.A068CR.01 · 41 mm

Audemars Piguet

Royal Oak Selfwinding 41 Stainless Steel / Silver

15510ST.OO.1320ST.08 · 41 mm