Speedmaster 57 Co-Axial Yellow Gold / Rory McIlroy / Bracelet

In Context

At 41.5 mm it is sized to the current mainstream: 40 mm is the median across every watch measured in this catalogue. At 16.5 mm it is very tall, and sits high off the wrist. 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. 100 m is genuine swimming resistance — more than the shape of this watch suggests it would need.

The movement winds itself from the motion of your wrist. 60 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.

331.50.42.51.08.001 stands on its own in this catalogue — no other reference here shares its base number. It pairs a champagne dial with a yellow gold case. Introduced in 2019. Beyond the time it carries a chronograph.

Special version of the column wheel, co-axial caliber 9300 for use in gold watches. Self-winding chronograph with Si14 Silicium balance spring, co-axial escapement, two barrels, column wheel and vertical clutch. Since 2015 certain watches containing this movement may carry the 'Master Chronometer' certification, indicating they have gone through the METAS testing cycle

10 other watches in the library run the Omega 9301.

Omega

Speedmaster Moonwatch Co-Axial Orange Gold / White

311.63.44.51.04.001 · 44.25 mm

Omega

Seamaster Planet Ocean 600M Co-Axial 45.5 Chronograph Red Gold / Ceragold / Alligator

232.63.46.51.01.001 · 45.5 mm

Omega

Speedmaster Moonwatch Co-Axial Orange Gold / Black

311.63.44.51.01.001 · 44.25 mm

Omega

Speedmaster 57 Co-Axial Yellow Gold / Silver

331.53.42.51.02.001 · 41.5 mm