Spooner or Goblet with Flower & Fern Etching and Unusual Stem

Saw this clear non-flint Spooner (thought it was a Goblet) at an estate sale last week and was quite impressed with the finely detailed stem that looks like it's upside down. The pattern is one of 4 petal flowers/berries hanging from flowered vines. The grey etching on the body consists of tiny flowers and ferns and go all around the cup. The rim is scalloped and smooth. It measures 6" tall and has a three mold 3 1/4" diameter base. I thought Central Glass as a possible maker but couldn't find it in my ref.. books. Any ideas? Thanks, RER(BOB)