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Omega Speedmaster Professional 145.022-78 Moonwatch 1980 Archive Falling R Cal 861 | Value Your Watch
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Omega Vintage Speedmaster Moonwatch Caliber 861 Chronograph... for $6,626 for sale from a Seller on Chrono24
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Omega Speedmaster Professional Chronograph 'Pre-Moon' Calibre 861 Circa 1969 – Carter Marsh: Pre-owned Luxury Wristwatches
OMEGA Speedmaster: The Evolution of Calibers 321 and 861, by Bernhard Stoeber — Horological Society of New York
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