thanks for your comments everyone!
Pulegoso style glass can be extremely frustrating when it comes to attribution. The technique of early Beranek pulegoso style glass and 1920's-1930's Venetian can seem very similar and also the technique itself can allow a small outfit, even without paperwork, to produce interesting pieces.... I was even wondering if Czech or Italian could be added English!! I am possibly thinking as an unsubstantiated guess, 1920's small Italian family with great skill just making tourist pieces to get by. The absence from the Beranek pattern book of this swan and no concave polished pontil made me think early Beranek less likely, though the glass looks plausible as far as technique goes.... and exceptions are known from every factory.
I am impressed that everyone thinks it is a skilful piece of work, even if the glass quality is basic, this seems to be the case in person too... Authorship seems (in some cases where glass-making is concerned) to have been unimportant at the time, hopefully a firm attribution is not impossible.... but then again, just enjoying the glass is paramount......... and it would be terribly boring if every piece on GMB had the email address of the maker on the bottom, there would be a very small forum! At least the swan is relocated safely and can now rest, where it can have hope of being confidently identified one day,
Robert (bOBA)