I took the pics. of this yesterday, and I'm sure It didn't have any cracks - now it seems to have one about 5 cms. long. Well at least it hasn't fallen apart yet.
the surface pattern and the four 'pinches' might, I suppose, indicate its more precise origin to someone - I can only suggest Bohemian, but not much more. About 11 cms. tall, and about 8 cms. wide - and with a fairly standard sort of iridescence. Grateful for any more thoughts, and thanks for looking. Paul S.