Air Post stamps. 1931, View of San Marino, 50c-10L, complete set of ten, six of which with sheet margins, full OG, NH, VF, C.v. $1,452, Sassone #A1-10, €2,000, Est. $400-$500 (Image)

Air Post stamps. 1933, Graf Zeppelin issue, blue or black surcharges on San Marino View stamps, 3L/50c-20L/3L, complete set of six, corner sheet margin or left sheet margin (5L/80c) blocks of four, a beautiful unit in every respect, full OG, NH, VF, each stamp signed by A. Bolaffi with his certificate for complete set, C.v. $1,760++, Sassone #A11-16, €2,600, Est. $500-$750 (Image)

Air Post stamps. 1950, 75th Anniversary of the UPU, Stagecoach 300L rose brown and brown, bottom left corner sheet margin imperforated single, full OG, NH, VF, C.v. $1,400, Sassone #A95a, €3,200, Est. $600-$800 (Image)