Ah, yes, a solution! It was apparently made according to Czech Glass Review, in 1950, shown in a 1950 copy of Czech Glass Review, describing it as being made at the former Moser glassworks in Carlsbad. It appears in Raban. J. (1963) in his Modern Bohemian Glass book, fig 18, "produced by the Moser-Carlsbad Glassworks, 1957. This can be read online at Jindrich's great site
www.cs-sklo.czI wanted to be sure, so I contacted Moser, whose helpful website person Veronika confirmed it:
"I have forwarded the pictures to the identification department and today the specialist has informed me that this glass piece was produced by Prof. Liskova. She used to have her own studio, where she made different glass pieces and this even seams to be one of them. For Moser glassworks Mrs. Liskova designed glass animals only, which were also produced here and sold with the Moser signature."
So the piece falls into the uncertain period of the glassworks site, that modern day Moser (kind of half) recognises!
Also, the Corning Glass museum site notes "From 1949 to 1961, she designed table wares for the Moser Glassworks in Karlovy Vary. In the early 1960s, she began to make flameworked utilitarian pieces in borosilicate glass. Her work evolved into abstract and figural sculptures. Lišková was the first flameworker to use borosilicate glass for large-scale sculpture." This vase certainly fits with her table wares production period and was certainly designed by 1950 as proven by the Czechoslovak Glass Review image.
So a happy ending, Ivo gets the imaginary rosette and (unfortunately) imaginary champagne for uncovering the location of fabrication .............
Robert