... I like this piece, and if any help at all, I shall try to locate several pics of examples that I once had...
ALL of which were firmly attributed to have being produced in USSR early to mid-c20th...
However, each of mine had a very distinct number & mark that was located about 2" inside of their neck...
I overlooked this, but they are very evident once you find them. These marks are also found upon some decanters.
I used my finger to feel for the marks (rather than to look for them)
and then by holding the piece sideways, they are then able to be read.
I am not suggesting that YOUR piece is Russian, but mine were, and the neck marks would be worth looking for,
as they are also highly desirable items, some of which are gilded, with "European Classical" designs, which is quite scarce for Russian items of the period...
They each seem to have been produced in white only, plus of course their coloured decorative features...
and all have a ground & polished pontil, and are heavy for their size.
John