Carbon spots which lead to zinc blisters which lead to zinc rot. Anything else going on is secondary to this pressing issue which will lead to the destruction of this cent. Spend it now, move on to other coins.
Ok, maybe idiot terminology was incorrect. The curved mark in question is raised with squared edges. What I was thinking was, there was something on the planchet before the strike. Given that it's only on the background and not the letters.
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