Thanks for the links, Frank. Neither of the vases on the german site are Pavel Hlava, both were designed by Oldrich Lipsky and date to 1960. These are sommerso type, blown in the round, so to speak, and then cut to create flat facets. Absolutely stunning, as either appear to be flat plane vases, or, when turned through 45 degrees, a wavy sided vase. These appear in square or rectangular, when viewed from the top. brown/ clear v common, as are the grey/clear combinations. amethyst/clear less so, and few, very few in blue/amethyst, which are three layer sommerso.
Also be aware that Libera glass, have issued examples similar, though cut on one plane only, recently. V expensive, and with no acknowledgement of who was there first. Lipsky, with only one arm, was, in my estimation, a major talent, who, like so many designers in Czechoslovakia, have been consigned to obscurity, by the obsession with Vizner, Libensky/Brychtova et al.
As I said previously, send me decent images, and if I have info, or can find it, I will post, once I'm in a position to comment further.
Regards to you all,
Monsieur Le Poulailleur, Marcus (alias Poultry Guard-dog en France)