Pretty sure it's DDD, that happens on a lot of nickel years. The metal flows quite readily into the giant cavity of Monticello. That halo around the dome is common.
Although on many years, I have wondered if it's actually die polishing, where the tool is catching the edge of the Monticello cavity. You see that halo a lot on the underside of the building as well, and often on the front edge of Jefferson's face.
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