Air Post stamps and covers. COLLECTION OF AIR MAIL TRIANGLES: 1936-45, almost 170 mint or used stamps, including 21 trial color and die proofs of center only, four revalued stamps of 1944-45 with No.C46A, in addition over 60 covers franked by these stamps and other values of No. #C4/13, occasional flaws possible, generally nice unit, full OG or used, F/VF, Est. $200-$300 (Image)