The company still exists in Zofingen/CH and the car is mentioned on their
history *) page, but there's nothing to find about specs or details.
(...) In der gleichen Zeit baute mein Vater ein eigenes Auto auf Basis eines FIAT 1100. Die meisten waren der Meinung es handle sich dabei um einen Prototypen eines italienischen Designers – das Auto kam aber aus Zofingen! (...)
....At the same time my father built his own car based on a Fiat 1100. By the look at it most were guessing that it must be a prototype sketched by an Italian designer, but the car was made in Zofingen, actually.
*) it's a 'safe' source with no other cars.