1951-S I'm thinking. Both appear to be normal from what I can see. There was no listing for a D/S in the old publication I have. (Maybe there have been some found since then. But yours aren't one. The bump above the lower serif is a damaged mint mark punch. Other examples of coins from that mint show it as well.
The Cherrypicker's Guide lists four different repunched MM's for this date, but no over mintmarks. None of the four pictured in the book look anything like your coin.
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