1991 Penny (no mint mark) possible error?

I found this penny and it almost looks doubled but I'm sure its a die error or something of that sort. Any ideas/thoughts?

 

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http://www.error-ref.com/split-peeling-plating/

Not worth a premium. Spend it before it rots.

 

+1. same as above. You are right, it is a die error. But a very common one.

 

No mint mark cent means it was minted at the Philadelphia Mint. Remember that.