Thanks for posting, nice photos and a pretty piece. It sure is similar in style to works by Unger, Kerr and number of other Newark jewelry firms. I don't know the maker, but hope someone else will.
I'm curious about the technique, usually this type of piece was stamped repousse with a backplate soldered in place over the hollow part. Something about the surface of your slide makes me think yours is a solid cast piece. Can you clarify this for us?