I've got a similar(ish) weight here and it also has a polished flat base, measures 2 5/8ins across x 2 1/4ins high, has "millions of tiny bubbles in it" although only some show up in the picture - loads of other tiny ones. Managed to get a decent picture of the canes (I think) although I've fuzzied its label. The label reads "La Serranissima Murano Made in Italy." Maybe this will be a clue for you.