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In order to ensure perfect readability, only anti-reflective sap- phire crystal is used in DAMASKO timepieces. With around 2,000 HV (hardness as per Vickers testing), sapphire crystal is the hardest usable crystal material, far surpassing all other alternatives in terms of scratch protection and shock resistance. Standard practice is to make the flat faces anti-reflec- tive on both sides. Upon request, the sapphire crystal can only be coated on the interior. In selected models, domed (convex) sapphire crystal is used. We install a UV-resistant crystal seal on all of our models.