First, I'm sorry for the lousy pics - I'm using my iPhone.
I found this roll hunting this afternoon. As you can see, the reverse side is the Lincoln Memorial and the obverse side is blank. The reverse detail makes it appear to be a copper cent, but the weight is 2.5 grams instead of 3.1 so it must be a zinc.
I've looked at the error definitions for Planchet, Plating and Blank but none of them really seem to fit, so I'm curious as to what type of error you think I've found.
Thanks

