I've seen these a lot on 82 and 83 cents. Seems that people use chemicals to remove the copper plating on the zinc. Not sure why but it seems everyone of these become bigger once the copper is stripped off. Something with the the zinc expanding to get the copper plating off. It's just post mint damage
Looks like what is known as a texas cent http://www.lincolncentforum.com/forum/showthread.php?35681-Plz-explain-how-this-happened