Good afternoon. I am new to coin collecting and have picked it up during this COVID mess. I have this penny I found in my change and it looks interesting on the reverse side. I was wondering if someone could help me understand what is going on and let me know if it is anything special. It is on a 1991 penny no mint mark. Any knowledge would be great, thanks.
@csands, this phenomenon occurs when the thin copper plating breaks on the design elements around the periphery of the cent and exposes the underlying zinc core.
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