3861

About the Omega 3861

It keeps the layout and the cam-actuated chronograph of the 1861, which had run the Moonwatch since 1997 on the architecture of the 1969 861, and changes what is inside: the co-axial escapement, the Si14 silicon balance spring, a free-sprung balance, and a hacking seconds, which the Moonwatch never had before. The reserve rises to 50 hours at 21,600 vph, with 26 jewels at 27 mm across, and the movement passes the METAS tests, including 15,000 gauss, that the Master Chronometer piece describes. It debuted in the Apollo 11 anniversary editions of 2019 and became the standard Moonwatch movement in 2021.

In the library it powers 32 Speedmaster Moonwatch references, in steel with hesalite or sapphire crystals and in gold, and 3 First Omega in Space references at 39.7 mm.

The 1861 is the movement it replaced, the 1863 the decorated version of that movement, and the 9906 the hand-wound Master Chronometer chronograph of the Speedmaster '57.