Air Post Stamps. 1936, Airplane and Dirigible, 5k-3a, complete set of nine, nice positional blocks of six, especially for triangle and diamond shaped stamps, CTO with full OG, VF (Image)

Air Post Stamps. 1936, Dirigible and Horseman, 25k violet and buff, perforation 11, horizontal pair imperforated between stamps, CTO with full OG (LH), VF and scarce, this variety is listed, but has no price in Scott (Image)

Air Post Stamps. 1936, Dirigible and Airplane, 25k x2 (perforation 14 and 11), 50k and 75k, four left sheet margin horizontal pairs, each with watermark ''1'' on margin, CTO with full OG, VF (Image)