:hb2: I have not been able to find this anywhere
It appears to be a clear cased bowl blown into a mould with a geometric pattern on the base (open to touch where you can feel the pattern) and then has a blue lining blown into the clear on the inside.
Weighs nearly 2 1/2lb (over a kilo) and measures 13cm diameter (5 1/4") by 5cm high (2") with the walls of the bowl 12mm thick(1/2"), Clear casing on the base is 1cm thick , blue lining appears to be 1cm thick as well on top of that. Straight up and down sides.
I thought it may be some kind of Scandinavian ashtray
lots of wear to the base edge.
The colour is more or less representative, that sort of really nice 'off' dark blue (not cobalt, definitely not teal) that I associate with Scandinavian glass (Ruda type blue ish) for some reason.