Heavy bubble glass bowl(Murano?)

This clear & blue bubble glass bowl is very heavy , I wouldn’t call it controlled bubbles as all different sizes & shapes ! It’s got some age to it poss 70s due to the scratching on the base , base is polished to a high standard, bowl is 5.5” across the top & opening is 3”, hight also 3”-
Thought Murano but unsure as can’t find the shape anywhere , no signature but looks like an oval sticker was on the side at some point !
Any ideas welcome please ..
Thanks for looking sd