I find Hi Sklo Lo Sklo by Mark Hill the best place to discover the range of possibilities in hot-worked Czech glass. If you've got it, sorry for the redundancy. Part of the problem is that quite a lot of this type of Czech glass is sold as Murano (and in Canada as Chalet). Yet there is a clear difference between Murano and the Czech glass in colour and shape. I'm not sure I could quite articulate the difference, yet I'm sure I could tell them apart. I'm particularly drawn to the Skrdlovice pieces.
I think if you start with the colours, especially the colour combinations, used in Czech glass, you will see a difference. On this piece, the shape, the little ears, the asymmetry, and how the surface of the glass has been worked all say Czech to me. Of course, given my track record, it wouldn't surprise me a bit if it turns out to be from somewhere else.
David