Royal Oak Perpetual Calendar 41 “Bleu Nuit, Nuage 50

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 9.5 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. 40 hours of reserve carries it overnight, but not through a weekend in a drawer.

26674CD.OO.1225CD.01 stands on its own in this catalogue — no other reference here shares its base number. It pairs a blue dial with a ceramic case. Beyond the time it carries a perpetual calendar.

Selfwinding perpetual calendar movement, featuring three patented mechanisms, Calibre 7138's functions are adjusted solely with the crown, removing the need for additional tools. Total of 423 parts including 41 jewels.

4 other watches in the library run the Audemars Piguet AP 7138.

Audemars Piguet

Royal Oak Perpetual Calendar 41 Sand Gold / Sand Gold

26674SG.OO.1320SG.01 · 41 mm

Audemars Piguet

CODE 11.59 Perpetual Calendar 38 Red Gold / Green

26441OR.OO.D405CR.01 · 38 mm

Audemars Piguet

CODE 11.59 Perpetual Calendar White Gold / Smoked Blue

26494BC.OO.D350KB.01 · 41 mm

Audemars Piguet

Royal Oak Perpetual Calendar 41 Stainless Steel / Blue

26674ST.OO.1320ST.01 · 41 mm