1930, Zeppelin issue, 40k dark blue and 80k carmine, complete set of two with perforation 12½, post office fresh, full OG, NH, VF, SC #258-59 (Image)

1930, Zeppelin issue, 40k and 80k, complete set of two in vertical pairs, perforation 12½, slight offset on pair of 40k, nice quality, full OG, NH, VF, SC #258-59 (Image)

1931, Airships, 10k-1r, complete set of five, all with perforation L12½, nice and post office fresh, full OG, NH, VF, SC #271-75 (Image)

1931, Airship over the Red Square, 20k paler red, left sheet margin single with a stroke over ''p'' in ''kop'' variety (position 11 in a part of drawing), full OG, previously hinged, VF, SC #273A Kc (Image)

1932, Airship over the Dnieper Dam, 15k gray black, perforation 10½, usual centering, full OG, LH, fine and rare perforation variety, SC #301B (Image)

1931, Ice-Breaker ''Malygin'', 30k-2r, imperforated complete set of four, nice margins, full OG, NH, VF, SC #286-89 (Image)

1931, Ice-Breaker ''Malygin'', 30k-2r, imperforated complete set in margin blocks of four, 3mm scissors' separation between stamps on 1r, ice-breaker special cancellation ''18.VII.31'', fresh and VF, SC #286-89 (Image)

1931, Ice-Breaker ''Malygin'', 30k violet, perforation L12½, left sheet margin single, imperforated on the left, full OG, NH, VF, Raritan Stamps guarantee, SC #290 Pa (Image)

1932, International Polar Year, 50k carmine and 1r green, the last one with perforation 10½, complete set of two, full OG, NH, VF, SC #297-98A (Image)

1932, International Polar Year, 50k carmine and 1r green, complete set of two, stamp of 1r has perforation 10½, slight gum wave on 50k, full OG, NH, VF, SC #297-98A (Image)

1933, Stratostat ''USSR 1'', 5k-20k, complete set of three, nice condition, full OG, NH, VF, SC #341-43 (Image)

1933, Stratostat ''USSR 1'', 5k-20k, complete set of three, very well centering and intact perforation, full OG, NH, VF, SC #341-43 (Image)

1934, Civil Aviation, 5k-80k, complete set of five, printed on watermarked Borders and Rosettes paper, slight gum wrinkle on 10k stamp, post office fresh, full OG, NH, VF, SC #355-59 (Image)

1934, Civil Aviation, 5k-80k, two complete sets of five, printed on watermarked and unwatermarked paper, full OG, mostly LH, VF, SC #350-54, 355-59 (Image)

1934, Civil Aviation, 5k-80k, complete set of five, printed on paper without watermark, flawless quality, full OG, NH, VF, SC #350-54 (Image)

1934, Civil Aviation, 10k green, right sheet margin horizontal pair printed on paper without watermark, imperforated between stamps, CTO with full OG (NH), VF, SC #351 Pc (Image)

1934, Stratosphere Disaster, 5k-20k, complete set of three, fresh and choice, full OG, NH, VF, SC #373-75 (Image)

1934, Airships, 5k-30k, complete set of five, stamps of 5k and 15k with slight offset on gum side, beautiful centering, full OG, NH, VF, SC #376-80 (Image)

1934, Airships, 5k-30k, complete set of five, nicely centered, full OG, mainly LH, VF, SC #376-80 (Image)

1934, Airships, 5k-30k, complete set of five stamps used on individual registered covers from Moscow to Zurich in 1935, each one uprated with definitive and commemorative stamps of other issues, all appropriate markings and arrival ds, fresh, VF and scarce grouping (Image)

1935, Chelyuskin Rescue, 1k-50k, complete set of ten, outstanding quality unit, full OG, NH, VF, SC #392-401 (Image)

1935, Chelyuskin Rescue, 1k-50k, complete set of ten, fresh quality, full OG, LH, VF, SC #392-401 (Image)

1935, Moscow - San Francisco Flight, red surcharge 1r on 10k dark brown, position 2 with missing leg of ''p'' variety, full OG, LH, VF, Soviet Philatelic guarantee hs, SC #420 (Image)

1935, Moscow - San Francisco Flight, red surcharge 1r on 10k dark brown, Moscow ''3.8.35'' date stamp on a piece, VF, N. Mandrovski certificate, SC #420 (Image)

1937, Aviation Exhibition, 1r black, brown and buff, souvenir sheet of four stamps, post office fresh quality, full OG, NH, VF, SC Block 3 (Image)