Omega
Omega cal 3861
Co-Axial (Omega) · introduced 2021
Beat rate
21,600 vph
Power reserve
50h
Jewels
33
Introduced
2021
Escapement
Co-Axial (Omega)
The cal 3861 replaced the 1861 in the current Speedmaster Moonwatch Professional, adding the Co-Axial escapement, a silicon balance spring, and METAS Master Chronometer certification to the iconic manual-wind chronograph platform. It is anti-magnetic to 15,000 gauss and rated to plus or minus 0/plus 5 seconds per day in the cased watch. A central bridge layout was retained to keep the familiar caseback view.
Specifications
Beats per hour
21,600
Jewels
33
Power reserve
50h
Diameter
28.0mm
Height
6.9mm
Escapement
Co-Axial (Omega)
Introduced
2021
Finishing
Fine
Service interval
8 years
Service cost tier
Luxury
Complications
chronographmanual wind
Known service issues
- METAS status requires authorized service to restore after movement work
Notable in
- Omega Speedmaster Moonwatch Professional 310.30.42.50.01.001
- Omega Speedmaster Alaska Project 311.32.42.30.04.001
References in our catalog using this caliber
Buying advice
Practical guides for buying a watch with this caliber on the pre-owned market: