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Watch Service: Omega Speedmaster Professional. Cal 1861. (The Moon Watch) – The Watch Professional
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
Introducing: The Omega Speedmaster Professional Moonwatch 'Master Chronometer' With Co-Axial Caliber 3861 - Hodinkee