Looks like circulation flattening to me. The silver colour is exposed zinc from either having been scraped or from just extreme circulation mishandling. Not a mint error, just post mint damage however created.
Damaged coin. Just a spender. Any damage void/reduces any premium for a coin. They are just cull coins with even a single scratch on the coin and could reduce the value as much as 90 percent if it were a premium coin. This one is just a spender:
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