Speedmaster Professional Moonwatch Yellow Gold

In Context

At 42 mm it is sized to the current mainstream: 40 mm is the median across every watch measured in this catalogue. 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 is hand-wound, so winding it becomes part of the day rather than something the watch does for you. 48 hours of reserve is enough to set it down on Friday evening and find it still running on Monday. At 21,600 vph the seconds hand advances 6 times a second, the slower and more audible rate of an older design.

3695.50.31 stands on its own in this catalogue — no other reference here shares its base number. It pairs a black dial with a yellow gold case. Beyond the time it carries a chronograph.

The 1863 is the decorated version of the Moonwatch's 1861. It is the same hand-wound Lemania-based chronograph with rhodium plating and finishing meant to be seen through a sapphire caseback. It powers 17 watches in this library, every one a 42 mm Speedmaster Professional. The [1861](/calibers/omega-1861) is the cam-actuated chronograph of the Speedmaster Professional from 1997 to 2021, on the architecture of the 1969 861; the 1863 replaced the 863 as its display-back version, with the same 18 jewels, 48-hour reserve and beat of 21,600 vph at 27 mm across. Mechanically the two are the same movement. In the library it powers 17 [Speedmaster Moonwatch](/brands/omega/speedmaster) references, the "Sapphire Sandwich" 3573.50 and its successors with sapphire on both sides. 4 are limited editions. The [861](/calibers/omega-861) is the 1969 original, and the [3861](/calibers/omega-3861) the co-axial Master Chronometer movement that replaced the whole family in 2021.

16 other watches in the library run the Omega 1863.

Omega

Speedmaster Professional Moonwatch Plexi / See-Through / Leather

3872.50.31 · 42 mm

Omega

Speedmaster Professional Moonwatch Sapphire Sandwich

3573.50.00 · 42 mm

Omega

Speedmaster Professional Moonwatch Chocolate / Bracelet

311.32.42.30.13.001 · 42 mm

Omega

Speedmaster Professional Moonwatch Plexi / See-Through / Leather

3872.50.01 · 42 mm