Rolf Ludewig's early kleinstrennwagen from late in 1948, using a front mounted Zundapp engine. Rolf took 4th place at Lübeck on 5th June 1949 and 3rd at Leverkusen on 28th August and that appears to be it. Perhaps he decided against converting to 500cc specification
The car still exists and is undergoing a rebuild at the Prototyp Museum in Hamburg
If anyone has any more details or photos of this car, please get in touch.