@cba, it looks to me like another cent was resting on this one and the pair were exposed to some sort of environmental conditions (e.g. in water at the bottom of a fountain) which resulted in a deposit or transfer of matter to the surface of this coin. I don't believe that arcuate mark is a mint error, despite it being raised.
"If you climb a good tree, you get a push." -----Ghanaian proverb
"The danger we all now face is distinguishing between what is authentic and what is performed." -----King Adz
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