I don't think we have any new input, but as it pops up commonly in the UK and is only significantly different from other painted Bohemian vases in that it is signed (although I did see one with 10 on it yesterday) I would go with Bohemian. I think that PK was a refining company rather than an individual, as the one piece I have handled, although of adequate quality, was nothing like this piece. In addition, the bases seem to vary, which implies different glass manufacturers. All this is just my thoughts.