Royal Oak Ultra Thin Tourbillon Stainless Steel / Black

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 8.85 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 is hand-wound, so winding it becomes part of the day rather than something the watch does for you. 70 hours of reserve is enough to set it down on Friday evening and find it still running on Monday. At 21,600 vph the seconds hand advances 6 times a second, the slower and more audible rate of an older design.

26512ST.OO.1220ST.01 stands on its own in this catalogue — no other reference here shares its base number. It pairs a black dial with a stainless steel case. Introduced in 2012. Beyond the time it carries a tourbillon.

The 2924 is the hand-wound movement of the Royal Oak Ultra-Thin Tourbillon of 2012. It is a tourbillon in a 4.46 mm movement with a 70-hour reserve shown on the back. It powers 21 watches in this library, every one a 41 mm Royal Oak. The tourbillon cage sits at 6 o'clock, the power reserve indicator sits on the movement side so the dial stays clean, and the beat is 21,600 vph with 25 jewels at 31.5 mm across. It is the movement that let a Royal Oak with a [tourbillon](/glossary/tourbillon) stay as slim as the time-only 15202, and it appears in the 26510 in pink gold, the 26522 in titanium and the 26521 in platinum. In the library it powers 21 [Royal Oak](/brands/audemars-piguet/royal-oak) references, all 41 mm; 9 are limited editions. The [2950](/calibers/audemars-piguet-ap-2950) is the automatic flying tourbillon that followed in 2019, and the [2121](/calibers/audemars-piguet-ap-2121) the ultra-thin time-only movement whose proportions the 2924 was built to match.

20 other watches in the library run the Audemars Piguet AP 2924.

Audemars Piguet

Royal Oak Ultra Thin Tourbillon Pink Gold / Blue Evolutive

26522OR.OO.1220OR.01 · 41 mm

Audemars Piguet

Royal Oak Ultra Thin Tourbillon White Gold / Japan

26522BC.OO.1220BC.01 · 41 mm

Audemars Piguet

Royal Oak Ultra Thin Tourbillon Pink Gold / Westime

26515OR.OO.1220OR.01 · 41 mm

Audemars Piguet

Royal Oak Ultra Thin Tourbillon Pink Gold / Baguette / Brown

26516OR.ZZ.1220OR.01 · 41 mm