Interesting you'd say. The dealer I bought it from specializes in vintage Steuben, and bought it as such. Afterwards, he researched the heck out of it and concluded that it wasn't Steuben. His attribution to Murano, however, isn't strong -- in talking with him, he seemed to know next to nothing Murano glass. My alternate theory is that it is much earlier Murano, circa 1930s, based on its having less of a "Modern" look. However, the piece really doesn't have the wear consistent with that age. I'd assumed 1950s/1960s when I bought it.
If after a while nobody on this board can help me out, hopefully the post can be "bumped" to general glass questions.