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types of glass


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Hello Everyone.

I have a couple of watches made by "Reidenschild Germany" which says on the back "DFC glass", I have googled it and it seems to be associated with making wine glasses !, but cant ascertain what it actually stands for?, and, being has the how the makers feel its important enough to say so, how does it stand in the scheme of things watch glass wise? in amongst mineral crystal, Seiko Hardlex, Sapphire ET AL.  Thanks in advance.

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It's difficult to know what the letters stand for in this context, but it's probably an anti-reflective scratch resistant coating like they use on optical lenses for spectacles, cameras, binoculars and the like.

I'd hazard a guess that the underlying glass is probably mineral crystal on the basis that, if it was sapphire, they'd say so.

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