Just to clarify, perhaps (?). A few similar designs of this bowl were designed at Skrdlovice at this time. After some discussions, it is thought that this bowl most closely resembles a bowl that is featured in a 1954 catalogue, one designed by Bohuslav Beranek, PN 5070.
Also I have to say, this new Bohemian-Czech glass department at GMB is rather good, well done mods etc...
Robert (bOBA)