From the images presented, I don't believe it is a mint error. It looks like a coin to which something happened to its surfaces after it left the mint - post mint damage - PMD.
As already noted, an acetone bath might help to remove the surface contaminants.
Collecting history one coin or medal at a time! (c) commems. All rights reserved.
Disclaimer: While a tremendous amount of effort goes into ensuring the accuracy of the information contained in this site, Coin Community assumes no liability for errors. Copyright 2005 - 2022 Coin Community Family- all rights reserved worldwide. Use of any images or content on this website without prior written permission of Coin Community or the original lender is strictly prohibited. Contact Us | Advertise Here | Privacy Policy / Terms of Use