Hey Kev I'll swap you one of my Ysart butterflies for one of your really good Baccarat ones c1845 - 60 LOL --- on a mercenary basis only?
Simone - I think this is Murano from the 1960s, I am going on instinct but the colour striations with the aventurine is very like a lot of Murano glass of the period and it is not implausible that makers of bowls and vases would use same glass for paperweights. The bubbles are scattered but kind of even. I have Murano paperweights with this type of bubbling - there is also the frothy bubbling of a company such as Ferro & Lazzarini - I should point out the polished surface is so Italian - ref the E, my that looks badly done but Italians are famous for this - see Carlo Moretti.
What happened to our Murano paperweight experts/website dealers?
Just my thoughts - it is beautiful btw