Can I ask, this I take it does not appear in the WF pattern books?
My reason for asking, is that I have seen these elsewhere. Peter's comment is a fair observation, that very accurate controlled bubbled techniques can indicate a particular company.
I am not saying for one moment that this is categorically not WF, but another serious candidate must be Harrachov.
Pattern ranges 15/2760 and 15/2764 were produced in blue and amber versions, but may well have appeared in other colours. Both examples shown on p84 of "275 Let Harrachovske Sklarny" (Crystalex, Novy Bor, 1987) are clear cased, but I have seen uncased examples.
Harrachov were a major manufacturer of controlled bubble glass, with designs by Metelak, from @1961, and much of the bud glass, supplied to importers such as Jaffe Rose, would have been made by Harrachov.
Text © Marcus Newhall 2006