1931 - Won Rio de Janiero GP 1934 - Won German, Swiss and Czech GPs (Auto Union) 1935 - Won Italian GP (Auto Union) 1950 - 3rd non-title Solitude GP, won at Grenzlandring 1951 - dns Italian GP (BRM) 1952 - 2 F1 attempts. ret Swiss GP (AFM), DNQ Italy (Ecurie Espadon-Ferrari) 1953 - 2 F1 attempts. ret German GP (own entry AFM-Bristol), nc Italian GP