1931, Ice-Breaker ''Malygin'', 30k-2r, imperforated complete set of four, stamp of 1r with ''a lamp on Zeppelin'' variety (position 19), full OG, hinged, VF (Image)

1931, Ice-Breaker ''Malygin'', 30k-2r, imperforated complete set of four used on Zeppelin North Pole Flight card and cover, all appropriate markings, VF (Image)

1931, Ice-Breaker ''Malygin'', 30k violet, perforation L12½, large white spot over ''B'' at the bottom variety, full OG, NH, F/VF and scarce (Image)

1934, Civil Aviation, imperforated trial color proof of 5k in carmine rose, right sheet margin single printed on watermarked Borders and Rosettes paper, full OG, NH, VF (Image)

1934, Civil Aviation, imperforated trial color proof of 10k in violet, printed on watermarked Borders and Rosettes paper, nice margins all around, full OG, NH, VF (Image)

1934, Stratosphere Disaster, Andrey Vasenko, 10k brown, left sheet margin single, imperforated on the left, neatly cancelled, VF and rare perforation error (Image)

1934, Airships, 5k-30k, complete set of five, nicely centered, full OG, LH (20k) or hinged, VF, C.v. $517.50 (Image)

1934, Airships, perforated trial color proofs of 5k in ultra, 10k in violet, 15k in red orange, 20k in brown and 30k in green, perforation 11, printed on watermarked Borders and Rosettes paper, very fresh and nice, gummed, VF and very rare, especially in complete set (Image)

1935, Chelyuskin Rescue, 1k-50k, complete set of ten, full OG, LH or previously hinged, mostly VF, C.v. $1.032 (Image)

1935, Moscow - San Francisco Flight, red surcharge 1r on 10k dark brown, position 13 of 25-stamp setting, full OG, NH, VF, Soviet Philatelic guarantee hs on reverse, C.v. $1,275 (Image)

1935, Moscow - San Francisco Flight, red surcharge 1r on 10k dark brown, position 23 of 25-stamp setting, full OG, previously hinged, VF, Soviet Philatelic guarantee hs, C.v. $725 (Image)

1937, Aviation Exhibition, 1r black brown and buff, souvenir sheet of four, perfect quality, full OG, NH, VF, C.v. $450 (Image)

1955, ''North Pole - Moscow'' Flight, red overprint on 2r black and yellow green, horizontal pair, right stamp without dash, left one with spaced ''Sev'' and ''Polius'', in addition stamp with perforation L12½, full OG, NH, VF (Image)

Air Post Official stamps. 1922, red surcharge 120m on Consular stamp of 2.25r, two values of types II and III, full OG, NH or VLH (type II), VF, various experts' hs on reverse of each stamp, C.v. $390 as hinged (Image)