I think there is (certainly in the U.K.) a more than average amount of interest in this type of bubbly glass, Otis. If you look at the chapter in Hajdamach, for example, he devotes quite a lot of ink to this type of glass, much of it produced in the first half of the C20, and some of which is very desireable. Possibly the variety seen most frequently is Walsh 'Pompeian', which does turn up not uncommonly, and ironically does exist in a blue very similar to this piece.
However, I don't think that any of them have a 'stub' type of pontil scar like yours, and the glass is usually far less strongly populated with bubbles that can be felt.
If you can find a piece of 'Pompeian' you'll see the difference - and which in any event is a good way of learning about similar but different types of glass