Ron Gordon on LinkedIn: Omega caliber 1861 (base movement Lemania 1873) is a manual-wind…
Omega] Movement shot. Omega caliber 1861. : r/Watches
Omega Caliber 3861 Watch Movement | Caliber Corner
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