Silver tarnishes. Thus why years ago, they used to have silver, silverware. It was a job to keep it from tarnishing. Thus when they came out with the plated platter ware, everyone jumped on it and never went back to the silver. So something on the plastic hold may be turning the edge of the coin. If it is mint packaging, it shouldn't do this. If it is not mint packaging, then it is altering/allowing the coin/coins to tone.
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 - 2026 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