Looks like acid damage ( PMD). There's no Misaligned Die or Partial Collar. The low weight is a dead giveaway of it being an acid coin. It's supposed to way 8.1 grams.
an acid dipped dollar - we see this a lot on quarters also. The copper is eroded by the acid faster than the cladding. (the copper is a much softer metal than the copper/nickel cladding.)
Dearborn said it all, I agree. Some household and commercial cleaners will do that, maybe was at the bottom of a tool box that had spilled stuff in it or a students experiment? Who knows. Bottom line is it is damage and has no extra value.
Agree with above. Hard to know what acidic environment this coin was in or how long it was in it. Even just being buried in highly acid soil can erode the copper faster than the cupro-nickel clad layer.
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