I know the coin itself is in bad shape, but, could this be a struck thru from the mint or is it just plain road rash?
Hum...lamination error? It brass, isn't it? I could understand a lamination error if it was Zinc and copper. But solid brass...hum, not sure about that.
Laminations are due to the mixing problems or voids in the alloy. Read about it here http://www.error-ref.com/?s=Lamination