PMD for sure. Looks like it might have been glued or stuck with some sort of adhesive to a textured surface.
There was a time during WW II and later that dimes were glued or taped to cards for the March of Dimes. These were then sent by smaller groups to collection points. Attached are photos of one that I have. It was part of the collection to be sent to the President from War Workers at Pearl Harbor. The dime is 1943. The image on the back is of a 1944 dime. There is an outside chance that your dime could have been used in a similar effort.