Royal Oak Selfwinding 37 Stainless Steel - Diamond / Grey / 50th Anniversary

In Context

At 37 mm it sits just under the modern norm — the band that suits the widest spread of wrists. At 9 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. 60 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.

15551ST.ZZ.1356ST.03 stands on its own in this catalogue — no other reference here shares its base number. It pairs a grey dial with a stainless steel case. Introduced in 2022.

The 5900 is the automatic Audemars Piguet introduced in 2022 for the 37 mm Royal Oak and in 2023 for the 38 mm CODE 11.59. It replaced the 3120 in the smaller cases. It powers 43 watches in this library. The point of it is thickness. At 3.9 mm it is a third of a millimetre slimmer than the 3120 it replaced, which is what let the 37 mm Royal Oak 15550 keep the proportions of the 41 mm 15510 rather than growing thicker to hold a modern movement. It runs at 28,800 vph with a 60-hour reserve, 29 jewels and 188 components, at 26.2 mm across, with a date and a stop-seconds function, and it is finished for a display back. In the library it sits under 31 [Royal Oak](/brands/audemars-piguet/royal-oak) references, the 37 mm 15550 and 15551 in steel, pink gold and white gold, many with diamond bezels, 10 [CODE 11.59](/brands/audemars-piguet/code-11-59) 38 mm references and 2 [Royal Oak Offshores](/brands/audemars-piguet/royal-oak-offshore). The 37 mm case accounts for 33 references and the 38 mm for 10. The [5800](/calibers/audemars-piguet-ap-5800) is its sibling for the 34 mm Royal Oak, the [4302](/calibers/audemars-piguet-ap-4302) the movement of the 41 mm, and the [3120](/calibers/audemars-piguet-ap-3120) the caliber both replaced.

42 other watches in the library run the Audemars Piguet AP 5900.

Audemars Piguet

CODE 11.59 Automatic 38 Pink Gold / Light Blue

7410OR.OO.A344CR.01 · 38 mm

Audemars Piguet

CODE 11.59 Automatic 38 Pink Gold / Silver

77410OR.OO.A402VE.01 · 38 mm

Audemars Piguet

CODE 11.59 Automatic 38 Pink Gold / Prune

77410OR.OO.A623CR.01 · 38 mm

Audemars Piguet

CODE 11.59 Automatic 38 Pink Gold - Diamond / Diamond - Sapphire

77410OR.ZZ.D343CR.01 · 38 mm