Thanks for the help. The top isn't cut flat (if that helps), looks to have been pressed flat when still soft.
I've attached a picture of the base, the pontil is concave, but there isn't any flat bit, ie just an edge if that makes sense.
I've got some bits of ariel - both Orrefors and Afors, and some Skruf thalatta, my first thought was that it felt closer to Skruf (you can feel the shape of the bubbles on the inside in a couple of places), but I can see some resemblance to Afors also (but not as thick).
However the closest piece visually I've seen to it is the Vattenlek Orrefors bowl on page 70 of Bill's book (Scandinavian Glass - creative energies).
What I do find most puzzling though is that I've never seen a signed one in 5 years of scouring the Internet and Ebay - two seconds but no signed pieces feels a bit unlikely to me - but happy to be proved wrong.