1924 20k on 10r, used on 15k stationery entire, registered in 1933 from Moscow to Valparaiso, Chile, with 15k on 70k Foreign Exchange Tax stamp on back, Buenos Aires transit and Valparaiso arrival pmks, fine cover to an uncommon destination (Cat No. C9) (Image)

Est.$150

1931 50k gray blue (error), h.r., well centered, v.f., cat. $500 (Cat No. C23a) (Image)

Cat. $500, Est.$250

1931 50k gray blue (error), h.r., well centered, v.f., cat. $500 (Cat No. C23a) (Image)

Cat. $500, Est.$250

1931 50k gray blue (error), used, well centered, v.f., cat. $300 (Cat No. C23a) (Image)

Cat. $300, Est.$250

1931 North Pole Issue, two imperforate sets of four used on two covers and two cards, flown from Leningrad via the Icebreaker "Malyguin" on the Polar Flight to Germany, with appropriate cachets and markings, one cover with minor toning, otherwise fine-v.f. (Cat No. C26-29) (Image)

Est.$200

1935 Chelyuskin Rescue, complete set, l.h. or h.r., fine-v.f., cat. $1032 (Cat No. C58-67) (Image)

Cat. $1032, Est.$500

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 brown, l.h., v.f., signed Romeko, etc. (Cat No. C68) (Image)

Est.$500

1935 Moscow-San Francisco 1r on 10k brown, h.r., v.f. (Cat No. C68) (Image)

Est.$500

1935 Moscow-San Francisco Flight by Levanevsky, 1r on 10k dark brown, n.h., perfectly centered, fresh and v.f., cat. $1275 (Cat No. C68) (Image)

Cat. $1275, Est.$500

1935 Moscow-San Francisco Flight by Levanevsky, 1r on 10k dark brown, lower case Cyrillic "f" in "Francisco", h.r., v.f., cat. $1500 (Cat No. C68b) (Image)

Cat. $1500, Est.$500

1937 Jubilee Aviation souvenir sheet, five copies, two hinged, others n.h., some usual gum offsets and wrinkles, v.f., cat. $1700 (Cat No. C75a) (Image)

Cat. $1700, Est.$500

1948 1r Airplane, variety imperf. at right, h.r., v.f. (Zagorsky 1251Pc, 90,000 Rub) (Cat No. C82var) (Image)

Est.$500