This model was extremely successful in racing, winning top five positions in the 2-litre class in 1925 and 1926 at the Le Mans but its greatest achievement was the victory in the first Mille Miglia race in 1927 where Ferdinando Minoia and Giuseppe Morandi led home an O.M. '123' at an average speed of 48 mph for 21 hours 4 minutes 48 seconds.