Luckily our local auction house which has been going for years will not attribute anything unless there is firm evidence (marks, labels, etc) giving it provenance. They will simply call it Art Glass or Coloured Glass and they do the same for all objects in their auctions (furniture, ceramics, etc). Very reliable.
Interesting piece you posted - my immediate thoughts are Polish or French, but that is simply a guess and I would not be surprised if it was non-European (I have in the past come across some really interesting Japanese pieces)