It is a Copper Plated Zinc Cent. Environmental Damage can cause the plating to get eroded then expose the zinc core.. As mentioned in first response causing zinc rot Not a Mint Error
Crappy-crud Zincoln! Write your Congressperson and demand that they fire the entire Mint staff. Chris
I dunno, man. As into toned coins as you are, aren't the two things both "damage," just of different sorts?