The known example of S over D looks nothing like yours/ The "D" is visible in the lower centre of the S and the MM is nearer the 4. Scroll down this till you come to it https://doubleddie.com/921576.html
While it may not have a great deal of value over face, it is a nice find and worth keeping. Well done.
Three words. Un. Freaking. Believable. Poor little thing. What shattered hopes and dreams? I'm really feeling for you, hope you pull yourself together.