I'm willing to bet $$$ that it's NOT Steuben
To start with I would like to say that I'm not an expert (not even remotely, so this is just my opinion) on Steuben.
Secondly, the mark as described (and illustrated in a previous message) does indeed seem to be correct. The mark is identical to that illustrated in Glassmarken Lexicon, which is one of the best resources available for glassmakers marks, and I (and my father) have yet to find any mistakes in the publication.
Finally........if the bowl isn't Steuben, it seems remarkable that I managed to guess that the piece was by them, given my limited knowledge. I don't know the factory very well, but I finally guessed the maker after recollecting similar pieces I have seen (although these were amber with black threads 'scattered all over' - as mentioned by grayhorse).
The only doubt I had was the fact that the bowl seemed to have a cut-off rim. This however may be a miss-interpretation of the image. If the rim is cut-off, then an eastern European origin would make sense (including a fake acid mark).