This is a mystery. I'm wondering if a cent was sitting on it and some kind of electrochemical reaction put a layer of copper on the nickel, which itself is mostly copper. Whatever it is, I'm fairly confident it happened after it left the mint, and that it is not worth very much.
📋 Item Submitted
Nickel with penny imprinted in it
M
Marc's Expert Appraisal
ANA-Certified Numismatist · Hudson Valley Numismatics



