This is a Gassy Zlincoln as Superdave said. I believe he was speaking about corrosion. And spoke of when the copper surface was exposed to the zinc core. I would consider it mid die state This is a zlinciln that was found in a Bank bag. Though some may call this circulated. You should first do some research as to what Uncirculated is defined as. If you look at the I in in, this is a grease filled or struck through debri "error". This is usually more evident on these zlincoln cents on the rev. above the memorial. Look for well struck coins first, when learning variety's and errors