Looks like a curved clipped planchet error. The Weakness on the 'L' on Liberty and the Blakesley affect on the opposite edge, assures me this is a real mint planchet error.
Well here is an active ebay sale for a clipped cent ( '68 memorial) but clipped a bit larger than yours is. 13 bids on it so far - highest bid so far? $3.81
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