DIN 3861/ISO 8434-1 Compression Ring and Cutting Ring Dimensions - FITSCH
Omega Speedmaster Professional Moonwatch 'Master Chronometer' with Co-Axial Caliber 3861 movement | Facebook
Introducing the Master Chronometer Calibre 3861: the driving force behind OMEGA's Apollo 11 tributes and a movement with its own lunar legacy - Watch I Love
Omega Speedmaster Professional Moonwatch 3861 Sapphire Sandwich Black Chronograph