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It is also mentioned in your chart that uv light does not pass

 

Regarding the discoloration due to uv light: we call it patina of the dial and mostly we find patina very attractive.
Another aspect of your introcuced glass is the hardness.
If you drop a sampphire glass watch, the glass can break.
The higher hardness of your glass means also thats it is more brittle.

Best
Moritz

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