To CCF Dahlc1976! What you have here is probably most likely a zinc rot bubble starting to form. It's a form of Post Strike Damage ( PSD), meaning that it happened after it left the U.S. Mint. As far as value goes, it's worth face value unfortunately.
Not an error, as E & V stated, probably a zinc bubble starting to form. Please crop and rotate your photos in the future as per CCF instructions. This will enable us to help you better.
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