This looks a lot like what happens when you put a cent in nitric acid. It reacts and removes surface material. And the appearance of your coin's surface is consistent with this theory.
📋 Item Submitted
I have a 1969 penny it missing the border around it and the penny is very thin ( very thin ) definitely not your original penny and its the size of a dime and would like to get it look at and appraised thank you
M
Marc's Expert Appraisal
ANA-Certified Numismatist · Hudson Valley Numismatics
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1968 dime error
Only error is in the question.