Sorry John,
I have made a little investigation and I was not correct - Zemek has worked for ZBS in 50ties. I suppose that we can attribuite this shape to him without serious doubts.
Frantisek Zemek was very tallented designer from glassmasters family. BTW his brother Karel was director of Mstisov glassworks...
You are true Frantisek Zemek was badly hurted by car accident on the way back home from Valaske Mezerici Glassworks and died very young.
more about Zemek here
http://picasaweb.google.cz/Jindra8526/FrantisekZemek?authkey=Gv1sRgCKX52IeMm9aJ8QE#but you should improve your Czech :-)
František Zemek (* 20.10. 1913 Zlatno u Lučence, + 31.5. 1960 Šumperk)1928 – 1938 Glassworks Dobronín na Vysočině, appretienship in glass cutting
1938 – 1940 Glassmaking school in Zelezny Brod
1940 – 1948 Academie of Applied Arts Prague, prof. Karel Štipl
1941 Practising in Nizbor Glassworks (Rückl)
1942 - 1946 Glasswork Reich Krásno
1947 - 1950 Glassworks in Teplice
1950 – 1956
Works for ZBS and Skrdlovice1956 – 1959 Teplické sklo glassworks in Mstišov and Karlovarské sklo – Moser
1959 – 1960 Osvětlovací sklo (light's glasswork) in Valašské Meziříčí