CZ Sapphire Transparent Watch Case , Sapphire Watch Glass ETA 6497 Movement
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Self Designed Sapphire Crystal Watch Case Suitable For 6497 Movement The Kyropoulos method, referred to as KY, was first proposed by Kyropoulos in 1926 and used for crystal growth, and for a long time thereafter, the method was used for the preparation......
ARH Sapphire Co., Ltd
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