Balbo Squadron Flight Italy - Brasil, "PRIMO VOLO TRANSATLANTICO IN FORMAZIONE DI STORMO", cover from Rome 1930-12-15 addressed to Rio de Janeiro 1931-01-22 and signed by 19 pilots (without Gen. Balbo) franked with airmail stamp 7,70 blue, certified Bolaffi (Longhi 30VAb, Sass. GP25a)
6; Flugpost; FLUGPOST INTERNATIONAL; Italien