I'd say Murano. My reluctance to label anything Poli is that I've never seen a reliable, i.e. a decent book or reputable auction house, attribute anything like these ashtrays or the original vase in this thread to Poli.
This is the the year that the book Seguso Vetri D'Arte, "the complete catalogue since 1933" by Heiremans is supposed to appear. That should settle some of the arguments.