Bidspirit auction | Italy - Air Post stamps

Italy - Air Post stamps - 1930, Trans-Atlantic Squadron, 7.70L deep blue and gray, left sheet margin block of nine, stamp with ''7 Stars'' variety in the middle, folded once along horizontal perforation between 2nd and 3rd rows, perfect quality otherwise, full OG, NH, VF and rare, each stamp signed by A. Bollafi in pencil, his certificate is included, C.v. $11,200 as singles, Sassone #A25, a, €18,000, Est. $7,000-$8,000, Sc. #C27, a