Thank you for all your work, Anne!
Fortunately I get the automized information regarding merging these topics which brought this pattern back to my screen. Until just now I hadn't seen that image of the matching tray... and immediately Bernard Cavalot's (RIP) mystery blue bowl came to my mind again:
Poland, Stolle Niemen 1923-1935 Tafel 97 item 1752 Unfortunately his images of 2004 have vanished - anyone out there who recalls this bowl too?
The catalogue is still unavailable online, I'm afraid.