Stamp on this

RCA Victor Christmas stamps

I came across these stamps on the back of one of the LPs listed below. Ed Lyman-He Walks With Me, RCA Victor, LSP-2095. 1960, one of their Living Stereo releases. I'm not too excited by gospel music, but I occasionally buy some for the cover, or some other odd, unexplainable reason. (My collection is full of things I can't possibly remember why I bought...) Anyhow, I've never seen these stamps before, and a quick Google search doesn't turn up too much info on them. One site was offering some for sale, and claimed they were from 1957. If anybody has any idea, please drop me a line.