An early example is the Isotta Fraschini Asso 750 which was used to power the Italian Savoia-Marchetti S.55 seaplanes flown by Italo Balbo into Century of Progress exhibition held in Chicago in 1933. This engine used the same layout as a recent series of engines produced by Bugatti - basically a vertical six with three adjacent banks of cylinders set at 60° each to make a W-18.