The listing, Mint Error-No Copper Plating has ended.
Beginning in 1982, pennies were made of zinc with copper plating. This 1999 penny has no copper plating which means the mint made an error and missed plating it. The coin is in great shape to the best I can tell. It was bought and is stored in a coin flip. Click "view larger" to get a better idea of the detail. Feel free to ask questions. I am unsure of the value. I am told errors like this can be worth as much as $50+ but I haven't done any research to be sure.