I'd love to believe it is a big name and the examples you found are really nice. But this is thickwalled, the stripes are random, the sides are pulled up as seen in knobbly Aseda / WF manner. It could be Murano - but I would not think the big ticket variety. But it could also be Maastricht, or something I have not thought of yet.
Pezzo unica di prove = unique proof piece