Royal Oak Chronograph 38 Stainless Steel / Blue

In Context

At 38 mm it sits just under the modern norm — the band that suits the widest spread of wrists. At 11.1 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. 55 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.

26450ST.OO.1356ST.01-B stands on its own in this catalogue — no other reference here shares its base number. It pairs a blue dial with a stainless steel case. Introduced in 2026. Beyond the time it carries a chronograph.

Developed and manufactured in-house by Audemars Piguet, Calibre 6401 is a selfwinding integrated chronograph movement introduced for the updated Royal Oak Chronograph 38 collection. The movement operates at a frequency of 28,800 vibrations per hour (4 Hz) and comprises 350 components with 44 jewels. It measures 27 mm in diameter and has a thickness of 5.7 mm. The power reserve is approximately 55 hours. Calibre 6401 drives a display of hours, minutes, central seconds, date, and chronograph functions. The chronograph architecture is fully integrated rather than modular, marking a departure from the outsourced movements used in earlier 38 mm Royal Oak Chronograph references. The movement is finished to Audemars Piguet standards and is visible through a sapphire caseback.

2 other watches in the library run the Audemars Piguet AP 6401.

Audemars Piguet

Royal Oak Chronograph 38 Pink Gold - Diamond / Beige

26450OR.ZZ.1356OR.01-B · 38 mm

Audemars Piguet

Royal Oak Chronograph 38 Pink Gold / Grey

26450OR.OO.1356OR.01-B · 38 mm