Introducing: The Omega Speedmaster Professional Moonwatch ‘Master Chronometer’ With Co-Axial Caliber 3861 The newest version of the Moonwatch replaces the cal. 1861 Moonwatch, after five decades. Continue reading ‘Introducing: The Omega Speedmaster Professional Moonwatch ‘Master Chronometer’ With Co-Axial Caliber 3861′ 0 Posted In: Uncategorized