If this is an error, how would you explain it? Partial / incomplete clip? Notice the detail of the wheat stalk in the bottom of the cavity:
Looks like it was squashed with a socket or a piece of pipe. If it were a mint error, the opposite side would not be distorted. Just PMD.
Definitely post mint damage. Notice how liberty has been obliterated opposite of the mark? It means that some great force hit it and caused liberty to get smashed into just flat.
