1924 10k on 5r green, basic stamp wide "5" variety, light cds, v.f., signed Mikulski, etc., cat. $700 (Cat No. C7a) (Image)

Cat. $700, Est.$250

1924 15k on 1r brown, surcharge inverted, l.h., v.f., signed Romeko, etc., cat. $1400 (Cat No. C8a) (Image)

Cat. $1400, Est.$1,500

1930 Zeppelin 40k and 80k imperforate singles, n.h., v.f., signed Mikulski, etc., cat. $5700 (Cat No. C12b-13b) (Image)

Cat. $5700, Est.$2,500

1930 80k carmine, horizontal pair used in 1937 with additional franking on registered cover from Moscow to Switzerland, 15k Foreign Exchange surcharged added on back, with Lugano arrival pmk, wax seal removed, fine and interesting commercial usage (Cat No. C13) (Image)

Est.$250

1931 50k violet brown, imperforate trial color proof on gummed stamp paper, large margins all around, l.h., v.f., signed Kessler. A significant Soviet and Air Post rarity, only 24 (!) recorded, this one being position 18 (indicated in pencil), with "D" Postal Museum handstamp on back, 1997 Buchsbayew certificate (Sanabria 40) (Liapine 334P1) (Cat No. C18var) (Image)

Est.$5,000

1931 50k gray blue (error of color), l.h., exceptionally well centered, v.f., cat. $500 (Cat No. C23b) (Image)

Cat. $500, Est.$250

1931 50k gray blue (error of color), l.h., exceptionally well centered, v.f., cat. $500 (Cat No. C23b) (Image)

Cat. $500, Est.$250

1931 North Pole, 30k imperf. "block of three", 35k single, 1r imperf. single and pair, used in 1934 on registered, Express cover from Moscow to Vienna, Berlin transit and arrival pmks on back, fine and unusual franking and usage (Cat No. C26-28) (Image)

Est.$250

1934 5k violet brown, perf. 14, n.h., v.f., signed Raybaudi, with his 2000 certificate, cat. $275 (Cat No. C50a) (Image)

Cat. $275, Est.$150

1935 Chelyuskin Expedition, 1k-50k complete, n.h. and post office fresh, each stamp well centered, fresh and v.f. A splendid set in superior quality, rarely offered this nice, cat. $2058 (Cat No. C58-67) (Image)

Cat. $2058, Est.$1,000

1935 Chelyuskin Expedition, 1k-50k complete, n.h. and post office fresh, each stamp well centered, fresh and v.f. A splendid set in superior quality, rarely offered this nice, cat. $2058 (Cat No. C58-67) (Image)

Cat. $2058, Est.$1,000

1935 Moscow-San Francisco 1r on 10k Levanevsky, n.h., v.f., signed Goznak, etc., with Sorani certificate, cat. $1275 (Cat No. C68) (Image)

Cat. $1275, Est.$500

1935 Moscow-San Francisco 1r on 10k Levanevsky, n.h., v.f., signed Goznak, etc., with Caffaz certificate, cat. $1275 (Cat No. C68) (Image)

Cat. $1275, Est.$500

1935 1r on 10k dark brown, v.f., tied by 26.8.35 Moscow cds on registered Air Mail cover to Berlin, address portion excised, otherwise v.f., with arrival pmk (Cat No. C68) (Image)

Est.$500

1937 souvenir sheet used and unused (n.h.), minor wrinkles, v.f., cat. $390 (Cat No. C75a) (Image)

Cat. $390, Est.$100