The thin copper shell is damaged and the underlying zinc is showing through. I suggest you return it to the mint and exchange it for one that's in better shape..
📋 Item Submitted
1983 penny all around rim is zink and zink over all lettering on both sides and zink and copper on Lincoln and on back building is zink and copper
M
Marc's Expert Appraisal
ANA-Certified Numismatist · Hudson Valley Numismatics
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