The Vintage Omega Speedmaster calibre 861 (caliber 861, cal. 861) built back up part by part: 105 parts and screws, with Omega part numbers from the Omega technical guides. The chronograph works and hour recorder go back in the reverse of the order printed in Omega's 1970 technical guide.
Chapters
0:00 Movement side: bridges, train and barrel
2:03 Chronograph works
5:16 Escapement and balance
6:18 Dial side: hour recorder and keyless works
9:20 Identify your own movement
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Drawings are our own schematics, not to scale. Part numbers from Omega technical guides. A "?" marks a screw not listed for this calibre. Watch Breaker is not affiliated with Omega.
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