Acorn Art Nouveau Purple Czech Striped Art Glass Pendant Necklace

Very unique Art Nouveau acorn cast & engraved design silver metal pendant with a prong set large oval deep purple & white striped art glass cabochon.  Top of pendant had a cast acorn floral bail that hangs from a textured silver cable chain with a pressure locking clasp.  In excellent vintage condition, no discoloration to silver or damage to art glass cabochon.  There is a designer signature/hallmark on the back side but I can’t quite make it out and am unfamiliar with it.  See photos.  If you recognize it please message me and let me know. 

Chain: 24”

pendant: 65mm x 40mm (includes bail)

cabochon: 32mm x 24mm