Air Post stamps. 1924, Airplane and Pigeons, 40c emerald, horizontal pair imperforated between stamps, full OG, NH, VF and scarce (Image)

Air Post stamps. 1930, Great Personalities, Juozas Tubelis, 10c dark blue, gray and black, block of four, top stamps with double impression of the central design, full OG, LH, VF and scarce multiple, Prof. U. Klein certificate (Image)

Air Post stamps. 1930, Great Personalities, Juozas Tubelis, 15c maroon, gray and dark blue, a single with double impression of the central design and strong shift of center and background, full OG, previously hinged, VF, Prof. U. Klein certificate (Image)