Thanks so much for taking the time to answer, Floor! I agree they don't look like Hubbell to me, either. I don't see any evidence of the powdery white stuff that is in a lot of Czech bead holes. There again, I don't see much evidence of them being worked on a mandrel either?!

Good point about being certain of glass, I am not. They have a somewhat porous surface, very few and very fine pores in the blue areas but larger pores, even small pits, in the brown areas. Also, where the brown is concentrated around the bead holes there is roughness like stone. Could these be stone? Where were the visual clues leading you?

Attaching two more photos, trying to show the brown area roughness at the bead hole but hard to capture.

Thanks again Floor, and Stefany, too!