1930, Moscow Zeppelin Flight, 40k ultra and 80k carmine, imperforated complete set of two in horizontal pairs, beautiful margins all around, full OG, previously hinged, VF and rare, especially in pairs, expertized by Z. Mikulski and others, C.v. $6,600 as singles, Est. $4,000-$5,000 (Image)

1932, Airship over the Dnieper Dam, 15k gray black, engraved printing, perforation 10½, nice centering and intact perforation for this difficult stamp, full OG, previously hinged, VF, C.v. $2,000, Est. $1,000-$1,500 (Image)

1934, Civil Aviation, 5k-80k, complete set of five printed on paper without watermark, full OG, LH or previously hinged, VF, Est. $150-$200 (Image)