Thanks for the explanation on the Buzzi attribution. The obvious evaded me there. It's still an interesting attribution. Buzzi was primarily an architect, designer, and artist from Milan with the Gio Ponti group. He was artistic director of, and a designer for, Venini 1932-4, his only two years designing glass. This isn't a 30's Venini-like ashtray. I would also expect the piece to be marked if it were Venini. And why attribute it to a designer without naming a maker? I suspect the attribution comes from the gold foil. I don't mean to be argumentative, Anne. I think I'm reacting to many listings on eBay a couple of years ago when Buzzi was used like Scarpa, some ridiculous attributions.
Aircooled: Sorry for hijacking the thread there. If you want to look for makers, I agree with Anita and Antiquerose that Barbini and Fratelli Toso are more likely, and from the 50's and 60's.