Thanks so much for the responses and the tip on how to display it - I'll give that a try. The colour is streaked evenly all over and it is a more lightweight glass than you'd expect from a czech piece, but still with a quality feel and some weight to it. The bottom is quite thick (1cm). The person I bought it from said that her parents used to bring back glass from their travels in the 60's and 70's and that it could be from Sweden, Denmark, Norway, Finland or maybe Italy but I would trust your better judgement a little more maybe. Anyway, the mystery continues...