I don't think it's fused glass either. It looks very much like it's blown. I haven't a clue about who would make such a piece, but I do know that I really like it. I have a piece that's also very light. It seems to have the same foil as the base decoration and then a thicker almost enamel looking surface decoration. I posted its picture on here, although I can't find the thread right now. If I remember correctly, Ivo thought it was Eastern European. I'll post an upside down picture to see if you think there are any similarities.
David
PS I'd do a swap in a minute. And who should post as I was writing this but....