Hi Emil,
Jindrich, in the 'zeptejte se -- solved issues' section of his website, answers a question about what
I think is this same vase (see Dve sklo union od Petra): It's Rosice 1292/100, designer and year yet unknown, and not Vizner.
It would we nice to see Vizner's vase side-by-side with the Rosice one to see what are the differences.
Anik