Ferrari has used the cavallino rampante on official company stationery since 1929. Since the Spa 24 Hours of 9 July 1932, the cavallino rampante has been used on Alfa Romeos raced by Scuderia Ferrari. The motif of a prancing horse is old, it can be found on ancient coins. A similar black horse on a yellow shield is the Coat of Arms of the German city of Stuttgart, home of Mercedes-Benz and the design bureau of Porsche, both being main competitors of Alfa and Ferrari in the 1930s.