Interesting piece. What is the treatment on the surface where it's not clear? Is it sandblasted, or sanded, or perhaps a scavo-like surface application?
It's not classic Murano pulegoso, where the bubbles are almost foamy. The classic pulegoso was created by adding kerosene to the glass, whereas this looks more the result of adding a sodium compound, lots of bubbles, but not frothy.
It looks quite modern to me, but I can't say I've seen it before.
David