What covers a watch’s dial is more important than you think.

A watch’s focal point is its dial — you don’t want to worry about the glass you’ve got to peer through. And yet, the pros and cons of different varieties of watch crystals are endlessly debated by enthusiasts. More than just a practical concern, a good crystal can significantly impact the design, user experience and even of a watch in several ways.
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https://www.gearpatrol.com/watches/a35180867/watch-crystal-guide/