1991-D Zinc Error Lincoln ?

[I_Dig_NYC]

Found this in my penny jug. It looks like a steel penny. There are no scratches. just what looks like a burn mark. Is it an error or somebody's experiment? Thanks for looking.

 

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[ClonedSIM]

Looks to be an unplated planchet error. A mint error where the copper outer layer was missing for one reason or another when the coin was struck. Nice find!

 

[Coinkid]

More than likely it was plated....you'd probably have to weigh it to find out.