The ancestor of all Mercedes Silver Arrows! With legal street us! The prototype differs in some details from the later racing version. So he has no behind the driver's seat patch scoop, no recessed gas cap. The windscreen is much wider, no brooklands screen. The backrest is more padded. Described is this prototype in "Mercedes-Benz Grand Prix 1934-1955" Author: George C. Monkhouse, Heel-Verlag, 2002.