I think I found a rpm, but I can't find it on variety Vista. Was wondering if you think it is a rpm or something else.
The more significant it is, the more it's worth. They are fairly common, so most of them aren't a huge premium. Take a look at this one, I think it's a match. Your's looks like a D/D/D to me, and the die chip in the B looks right: http://varietyvista.com/02a LC RPMs Vol 1/1957DRPM014.htm