Hi,
Imho, Spojené České Sklárny n.p. Heřmanova huť, Czechoslovakia. Certainly the size would be right, as this is probably a variant of the 230mm diameter bowl, pattern number 19617, which dates to 1947, and almost certainly designed by FrantiÅ¡ek Pečený, as the pattern numbers for this service come immediately after his "Halifax" pattern service, which is well documented as his first pattern for the factory. Sadly, the 1950s catalogue does not show this exact variant. However the underbowl radial ribbing would be consistent with the pattern, I am thinking of.
Regards,
Marcus