Ralf-Stetysz was the marque of one of the earliest Polish car manufacturers begun in France and transferred to Poland in the 1920s.[1] It was formed in 1924, when Count Stefan Tyszkiewicz, an inventor and mechanical engineer, started a small automotive firm "Automobiles Ralf Stetysz" in Boulogne-Billancourt near Paris. The name was an acronym in Polish of the name "Rolniczo Automobilowo-Lotnicza Fabryka Stefana Tyszkiewicza" - "Agricultural-Automobile-Aero Factory of Stefan Tyszkiewicz").[2] Tyszkiewicz designed several prototypes, drawing heavily on contemporary French car designs, but better suited for the dismal Polish roads of the time. A single prototype was completed, with a strengthened suspension, a locking differential and a powerful Continental engine. It was presented at the 1926 and 1927 Paris Motor Show, where it received positive reviews as a good "colonial car".[3] The prototype proved interesting and in 1927 Tyszkiewicz was able to secure cooperation with the Warsaw-based K. Rudzki i S-ka company to start serial production, under the Stetysz brand. The company produced all the mechanical parts and assembled the vehicles while the bodywork was manufactured by Plage i Laśkiewicz