I think it is a mint error because I have a 1968 no mint mark. On the rim below Liberty has the same mark your Penny has. And above the C on the opposite side I see something that looks like yours, but not as noticeable.
Troy Meyer1, without an image I'd only be guessing. Maybe the same OP example released back into circulation. Since 2014 I see a few added comments saying they have the same or something similar, even an unrelated possible doubled die date, but In all honesty I need something to examine prior to any attempt at confirmation. Thanks, Doug.
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