Topic: funny looking mushroom shaped thing??? bubbles in stem.. scandi.. what is it??

[jonchellycain]

Hi all picked this up from a car boot on sunday for just 20p, im not even sure what it is let alone who by..
Right, its made from very clear glass with lots of little bubbles in a dome shape in the stem. what i think is the bottom, is not flat or even, it doesnt appear to have been ground or polished  and there is a slight lip to the edge, and a sharp bit... (all very confusing)
The top is slightly concave (looks like a glass tea saucer), i believe it has been applied to the stem.
It stands at 9/10cms tall, 16cms across the top and weighs in at 650g
anybody know who what or where on this one??
many thanks
michelle

[Frank]

Comport base re-cycled?

[jonchellycain]

ahhh so it would have gone the other way up?? stem up, looks right, but there is absolutly no wear on the rim at all, maybe broke when new?