I'm liking the reverse as a partial missing cladding. The copper area doesn't show any signs of acid damage, it's still struck sharp. The obverse looks like rust?
It's clear that the copper-colored surface on the reverse is not a missing clad error. In certain areas, like the D of DIME, the surface was scraped after the coin left the press, and this has revealed underlying copper-nickel cladding.
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