Difficult to explain what I mean, wish I could show you instead.
If the cup does not narrow down much ( or points inwards) at the point where it meets the body, but looks almost like a straight line down (all in comparison to similar ones) then it could be Belgian from a place called Verreries de St. Ghislain. I have a piece of catalogue here (no date on it but definitely before 1900) showing two such models.
But again, every country involved in making bulb vases, had this model somehow or other on offer.
Patricia