Speedmaster Moonphase Chronograph Master Chronometer Stainless Steel / Black / Bracelet

In Context

At 44.25 mm it is a large watch — well above this catalogue’s 40 mm median, and enough to dominate a narrow wrist. At 16.85 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.

304.30.44.52.01.001 stands on its own in this catalogue — no other reference here shares its base number. It pairs a black sunburst dial with a ceramic, stainless steel case. Introduced in 2016. Beyond the time it carries a chronograph and a moon phase.

Automatic movement with column-wheel operated chronograph, moonphase indicator and date, introduced in 2016. Baed on caliber 9300, the 9904 features a moonphase indicator at 6:00. The date is now shown through a subdial at 9:00. This movement furthermore is magnetic resistant to over 15,000 gauss, features a silicon SI14 balance spring and a free sprung balance, Omega's 3-level co-axial escapement and 2 serially mounted barrels providing a power reserve of 60 hours.

6 other watches in the library run the Omega 9904.

Omega

Speedmaster Moonphase Chronograph Master Chronometer Stainless Steel / Blue / Alligator

304.33.44.52.03.001 · 44.25 mm

Omega

Speedmaster Moonphase Chronograph Master Chronometer Stainless Steel / Sedna Gold / Brown

304.23.44.52.13.001 · 44.25 mm

Omega

Speedmaster Moonphase Chronograph Master Chronometer Stainless Steel / Yellow Gold / Silver

304.23.44.52.06.001 · 44.25 mm

Omega

Speedmaster Moonphase Chronograph Master Chronometer Blue Side of the Moon

304.93.44.52.03.001 · 44.25 mm