Timepiece360 - This Pre-Owned Omega Speedmaster Professional Moon Chronograph 42mm with steel case, black aluminium bezel, steel bracelet and black dial is in very good condition. Mechanised by Omega Calibre 1863 manual
Omega Speedmaster Professional 1863 — Hodinkee Community
Omega Speedmaster Movements: 1861 vs. 1863 - Bob's Watches
Omega] Now discontinued caliber 1863, are you going to miss it? : r/Watches
Omega caliber 1863 » WatchBase
Omega Speedmaster Professional Calibre 1863 - A5 5.8x8.3" — INKDIAL
Omega Speedmaster Professional Moonwatch Cal. 1863 Watch 3572.50
Omega Speedmaster Moonwatch: review, live pics | The Watch Observer
Omega Speedmaster Movements: 1861 vs. 1863 - Bob's Watches
Omega Speedmaster Moonwatch Professional Chronograph Review – Watch Advice