Thank you all (m, Roberta, Kimo, John, Ken) for your help, greatly appreciated!
This seems to be a real ID challenge
First, I am totally open for the idea that it is a new piece.
But I am still wondering for what kind of market such a small, dainty yet technically complex piece would have been produced; if just to mimic Art Nouveau, why not iridize the whole thing, and choose a less excentric colour?
I think I would never be able to tell if the wear on the base could be added deceitfully; to me it looks natural. It is found - in varying amount - on the areas where the vase sits on. If that hints on older production or not...
And thanks for all the links (and pics of beautiful glass).
Four-dimpled shapes seem to have been extremely popular in early 20th century Bohemian production -- found in so many Kralik and Lötz ranges.
But I couldn't find an exact shape match either.
Those S&W-attribution pieces seem to be much thicker glass.