ok, here is another mystery (for me anyway).
My guess is that it is venitian but I really have no idea.
It's crystal (has a good ring when flicked).
It's big = 11 inches tall
It's 730g
I don't know how to describe the methods of work that have gone into making it but:
base looks like those on a blown glass: ie ridges etc.
the stem is twisted (whilst hot?)
the bowl is raised on the inside (like little lenses) rather than depressed or dimpled.
the top edge is a series of little crests.
Any help with ID, age, origin, etc. Idea of value would be nice but not that important as I bought it already!