as you havent got any replies, i'll give you my thoughts, could be way out
Colours say Kosta Boda to me, Goran Warff,maybe, but then it would probably have a signature.
And the shape, size, weight, makes me think Czech
Hey, its a start, it might start the suggestions rolling in now!
ps thinking about it , im leaning towards Czech, c 1960s, Marcus may have an idea if he pops in