Ich werd´bekloppt! Wie hast Du das denn herausgefunden?
Wow. Allemano made it with his first guess!!
It is indeed one 1920´s Helios Kleinwagen, built in Cologne by Helios Automobilbau-AG Köln Delfosse
Einfach etwas geblättert...
Actually it was sheer luck, but found a drawing of the Helios in a magazine. Though the body work is slightly different the overall proportions match the puzzle car, so, I made a try.
Will scan and post it later.