Service: Omega Speedmaster Professional 145.0022 calibre 1861 | Watch Guy
Be Careful: Fake movement Speedmaster Pros | Omega Forums
Omega caliber 1861 » WatchBase
File:Detailed view on chronograph pushers and crown (with open watch movement) of an Omega Cal. 1861 chronograph movement from an Omega Speedmaster (cropped).jpg - Wikimedia Commons
Service: Omega Speedmaster calibre 1861 | Watch Guy
SOLD - Omega 1861 movement, new never used | Omega Forums
Speedmaster Moonwatch Professional Collection | OMEGA®