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OMEGA Speedmaster Moonwatch – The All-Important Question: Hesalite Or Sapphire Crystal? | Swisswatches Magazine
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Hands-On With The Omega Speedmaster Professional Moonwatch Master Chronometer Sapphire Sandwich | aBlogtoWatch
Why do many OMEGA Speedmaster fans prefer the delicate hesalite crystal over the much more scratch-resistant sapphire crystal? I like my Speedmaster Speedy Tuesday, but the thought of the fragile hesalite has
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