Mineral Sapphire Watch Crystal Date Calendar Window Magnifying Glass Watch Parts Square 7×5.5mm 5.8×4.5mm Round 5.5mm. Sapphire is harder than mineral glass.

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Mineral Sapphire Watch Crystal Date Calendar Window Magnifying Glass Watch Parts Square 7×5.5mm 5.8×4.5mm Round 5.5mm. Sapphire is harder than mineral glass.