Royal Oak Selfwinding 77321 Yellow Gold / Diamond / MOP / Alligator

In Context

At 33 mm it is small by current standards, in the range most wristwatches occupied before cases began growing through the 1990s. At 10.4 mm thick it is about average for a modern wristwatch. The case back is closed, so the movement stays out of sight, 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. At 28,800 vph the seconds hand advances 8 times a second.

77321BA.ZZ.D012CR.01 stands on its own in this catalogue — no other reference here shares its base number. It pairs a white dial with a yellow gold case.

Basic thickness : 4.00 mm Total diameter : 21.30 mm Frequency : 28,800 vibrations/hour (4 Hz) Number of jewels : 28 Minimal power reserve : approx. 40 hours Unidirectional automatic winding (clockwise – the dial side) Oscillating weight mounted on an unlubricated ceramic ball bearing, with one segment of the weight made of 21-carat gold Balance with variable inertia blocks Flat balance-spring Mobile stud-holder

7 other watches in the library run the Audemars Piguet AP 2240.

Audemars Piguet

Royal Oak Selfwinding 77321 Stainless Steel / Diamond / Silver / Alligator

77321ST.ZZ.D012CR.01 · 33 mm

Audemars Piguet

Royal Oak Selfwinding 77321 Pink Gold / Diamond / Silver / Bracelet

77321OR.ZZ.1230OR.01 · 33 mm

Audemars Piguet

Royal Oak Selfwinding 77321 Pink Gold / Diamond / Brown / Rubber

77321OR.ZZ.D080CA.01 · 33 mm

Audemars Piguet

Royal Oak Selfwinding 77321 Stainless Steel / Diamond / Black / Alligator

77321ST.ZZ.D002CR.01 · 33 mm