The maker was Royal Dux, Czechoslovakia - who you normally associate with animal figurines and very ornate pottery. Information about Royal Dux is hard to find as most of the information and a lot of their records were destroyed during the 1950s.
However Royal Dux produced a whole range of pottery we rarely seem to see in the west, often referred to as the "Brussels"style. There is a fantastic blog about the Brussels style HERE
The blog mentioned above has some great examples Royal Dux and other Easter European modernism on their site well worth having a long look at.
The colours in my bowls are almost identical to the colours in this picture I found on the Brussels58 blog .
|Porcelain Ashtrays by Mark Henry, Jaroslav Jezek from Royal Dux (via Brussels Expo '58)|