Thank you very much Sue and John!
Right -- the casing colour may have mislead me...
@Sue: I like that early Mtarfa range!

I don't have the exact dimensions here, but it is appr. 20 cm high, and looks quite nice beside my Mdina cylinder vases (thought the diameter is a bit smaller)
Mtarfa used a green base colour (pic of my ashtray attached), but with silver chloride decor.
MDG also has a similar green, but everything else doesn't fit imho. (Pic of my green bottle attached)
After John's post yesterday I did search the glassworks Ekenas, Plus, Randsfjord and Johansfors. But I couldn't find anything really similar (and for some the base finish doesn't seem to fit). Then I went out of Scandinavian glassworks to google for

Regarding you are both based in the UK and I bought the vase from there -- I think you would have recognized it if a British maker was another possibility?
Greetings from Vienna!
Michael