It is beyond me why you conclude this damage didn't take place after the coin left the mint. As you are the proclaimed expert, I'll defer to your good judgment.
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Curious as to what type of error this is, the coin is perfectly flat so I know it wasn’t done after minting and you can still see details of the image on back and the letter US in dent on the reverse side
M
Marc's Expert Appraisal
ANA-Certified Numismatist · Hudson Valley Numismatics
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