I am not sure if I have the correctly identified this dime, It was found from my pocket change and probably quite common. I believe that it is a collar clash. It extends from 7 to 1 on the rev. This is not something I usually look for but, the dime was in such nice shape it jumped out at me.
They say that's the first to go then your memory. Could be the other way around, hell I don't remember.