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Omega Speedmaster Pro 3572.50 Hesalite/Sapphire Exhibition Moonwatch Cal. 1863 40mm – Element iN Time NYC
Omega Speedmaster Professional ref. 3572.50 Tritium Dial Hesalite + Sapphire Sandwich | WatchUSeek Watch Forums
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OMEGA Speedmaster Moonwatch – The All-Important Question: Hesalite Or Sapphire Crystal? | Swisswatches Magazine
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