Or perhaps it's stamped a cent on top of the dime, except that ain't it either. Just lots and lots of corrosion.
It is a damaged Cent. Not a mint error of any kind. That Cent got caught in between the wall and the drum of a dryer and was damaged by heat and tumbling. And don't tell me that I'm wrong.. I have been doing this for 34 years!
Clearly you don't know the difference. Here are a few links for you to read: https://www.cointalk.com/threads/tw...-date-us-one-cent-lincoln-shield-coin.318794/ https://www.coincommunity.com/forum/topic.asp?TOPIC_ID=143863
No problem. Here is a website that explains Mint Errors and Damaged coins http://www.error-ref.com/part_xi_-_non_errors/
It is, as mentioned, a modern US Shield cent, heavily damaged, and likely a "dryer coin", as mentioned. The heavy wear resulted in the exposure of the cent's inner zinc core, which is why it has that silvery color around the edges. Modern post-1982 cents are mostly zinc, with only a thin outer layer of copper. Moved thread to US Coins forum.
You can see the bust of Lincoln upside down. And you can see the shield. Zincs weigh 2.5 and dimes weigh 2.27 but given the condition the weight loss would be expected. You can safely throw this away.