Not likely an error. Looks to me like this was treated with acid, which wears off the outer nickel shell.
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I've looked online to see what errors this particular quarter may have and it's saying there are no known errors for this state
M
Marc's Expert Appraisal
ANA-Certified Numismatist · Hudson Valley Numismatics
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1928 quarter
A Standing Liberty Quarter worth about $6.
Found a beat up coin in a roll of quarters. Trying to define any…
you hit the nail on the head with the last comment.
Copper us Kansas quarter I think.
Just a state quarter!