Many thanks, Anne. I did look in that catalogue but had trouble finding my way around. Thanks for the tip.
I did read in Marcus's book that the signature "Tcheco-slovaquie" was banned by the Nazis, so I think that makes it pre 1939. I also know it was made for the French market (because of the spelling) and it must have been after 1921 when that country came into being with that name. However, that name may have been re-introduced after the war, but Marcus's book says he does not know when, if it was.
The diameter is 22cm.
Is it possible to identify the pre-war designer? It is a really well-made piece.
Many thanks for your help.