This isn't my coin, but I found it so interesting that I'm posting it here. To my eyes, it looks like the coin was first worn nearly smooth, then over time crystallization upset the coin's surface.
Btw--a dealer is selling this coin; any guesses what they want for it?
Check out the photos on the pages I linked--the whole structure of the coin gets crystallized--it is irreversible. Most coins aren't as severe as the one above, which I consider almost past being a coin--worth $80?
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