Amazing car, and its identity is also amazing. I am very interested in your source, as this car is listed elsewhere as bodied by Heinrich Buhne of Berlin for Baron von Alvensleben as a second body on a 1932 Rolls-Royce 20/25 chassis with slanted radiator to the front. (German Automobile Coachwork by C.Benter and H.Schrader, 1976). It is certainly not a Phantom III as the radiator is positioned after the front axle, and the Phantom III would have it much further forward.