Thanks Lynne & Dexter
The trouble is, I just can't square the amount of work involved in this design with a small studio. It seems unlikely that a small group of artisans could make something like this, doesn't it? On the other hand, L Dosta'l (I've tried all manner of variations) doesn't come up with anything. Dostal is presumably a Czech name, but I can't find anything like this anywhere - but perhaps that person isn't producing glass now...and it doesn't account for the apostrophe. :roll:
If no-one comes up with anything, I will email Beranek. That will shut off one avenue at least!
Edit: I've rooted around and I'm thinking the apostrophe is actually an accent over the a. That would link in with Czech and possibly Polish spelling of the name Dostal.