Possible mint error Penny

[Beans]

Found this while hunting pennies. Front is missing In God We Trust, LIB in liberty, last digit on date and most of the mint mark is missing. On back the Un is missing from United. Ran my thumb nail around the edge/rim, bottom of the front is missing some edge but Lincoln has a normal edge on the bottom part of the jacket, on the back the edge/rim is complete.

 

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[Tabfry]

Well... I'll offer my thoughts, but I'm no expert.

Since there is no exposed zinc, I'd rule out post mint damage. It looks like a grease filled die to me.