It's a fairly typical Italian shape, with fairly consistant fire-polished rim, and I was going to suggest Empoli - where much of this type of lighting seems to come from - but then I read the description of the matt surface... so now I'm doubtful.
I know that Kastrup, and later Kastrup-Holmegaard, finished some of their white-opal lighting in this matt fashion, but I would probably expect to see a ground or ground/polished rim.
I believe that matt white-opal lighting was also popular amongst a few German firms during the 1950s-70s... but I wouldn't associate this shape, particularly, with German glass.
So, essentially, I dunno!