Hard to state in absolute terms, but without pictures, it may be a case of a Grease Filled Die. Review the tutorial on how to post photos and go ahead and post a picture. There are a number of folks with deep expertise who can confirm what you have there.
I agree that it is most likely a minor grease filled error. Nice to keep for an example. It's also a Copper cent which carries a tiny bit of metal value above face value.
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