It seems that if you go to enough household sales you can find just about anything...
These are really different. There was a huge "organic look" movement in Italian art pottery in the 1950s and 1960s lead by artists like Gambone and Fantoni. These beads are most certainly part of that modern mindset.
There were glass artists who worked parallel to these ceramists. Scarpa, Barovier and Tosso come to mind first. They did not make beads but rather vases, sculptures, lamps and larger hot shop blows - no lampwork. Google Image search those names, with the word glass, and be prepared to have your glassy mind blown.
I love these beads. They have a black base that's wrapped in silver foil (not leaf) and then blobbily (inventing a new word) encased with clear. I am so going to try and re-create these beads.