Royal Oak Ultra Thin Tourbillon Openworked Yellow Gold / Boutique Edition

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.

26513BA.OO.1220BA.01 stands on its own in this catalogue — no other reference here shares its base number. It pairs a skeleton dial with a yellow gold case. It was a limited edition. Introduced in 2012. Beyond the time it carries a tourbillon.

Hand-wound, open-worked movement with tourbillon escapement and power reserve indicator.

3 other watches in the library run the Audemars Piguet AP 2924 SQ.

Audemars Piguet

Royal Oak Ultra Thin Tourbillon Openworked Pink Gold

26518OR.OO.1220OR.01 · 41 mm

Audemars Piguet

Royal Oak Ultra Thin Tourbillon Openworked Stainless Steel

26518ST.OO.1220ST.01 · 41 mm

Audemars Piguet

Royal Oak Ultra Thin Tourbillon Openworked Platinum

26511PT.OO.1220PT.01 · 41 mm