Sorry, Nadine, the experts seem to be 'out to lunch' at the moment, so I'll put in my two-penn'orth (and probably get it wrong, as usual :oops: :roll: )
Weights like yours are made in a lot of places and it's hard to say exactly who is doing them. It might well be somebody in China, India, or Italy, but we don't know exactly who those people are.
However, having seen someone making paperweights, I can say that IMHO these pretty twist weights are too easily dismissed as 'mass produced' and 'unimportant'. It actually takes a degree of skill, talent and experience to manupulate glass into these clever twists and spirals.
I'm sorry to say that I don't think you're going to be able to identify the origins of your weight, though :? Still, just enjoy it!
I have lots of 'unidentifyable' weights in my collection, and I guess we'll have to accept the fact that we'll probably never know who made them! :roll: