1924 10k on 5k green, wide "5" variety, two distinct colors (green and yellow green), l.h. or h.r., fresh and v.f., signed Romeko, Mikulski, etc., cat. $2500 (Cat No. C7a) (Image)

Cat. $2500, Est.$1,500

1924 10k on 5k green, wide "5" variety, used (canceled to order), v.f., cat. $700 (Cat No. C7a) (Image)

Cat. $700, Est.$350

1924 15k on 1r red brown, double surcharge (!), unused without gum, small toned spot at right margin, still a v.f. example of this rarity, with 2016 Zagorsky certificate. Only a few recorded (Zverev 62w, $12,500) (Cat No. C8var) (Image)

Est.$2,500

1931 Airships, imperforate blocks of four, set of five, fine-v.f. (Zverev $5,000) (Cat No. C15-19) (Image)

Est.$1,500

1931 50k gray blue, bright color, block of four, centered to top, lightly hinged at top, bottom stamps n.h., scarce block (Zverev $25,000) (Cat No. C23a) (Image)

Est.$5,000

1932 15k gray black, imperforate horizontal pair, n.h., folded between stamps, v.f., signed Stolow (Zverev $15,000) (Cat No. C25c) (Image)

Est.$7,500

1933 Stratostat U.S.S.R., 5k ultramarine, imperforate single, h.r., tiny natural inclusion at upper left, v.f. (Zverev $6,000) (Cat No. C37var) (Image)

Est.$2,500

1934 Civil Aviation (unwatermarked), 10k green, horizontal pair imperf. between, used (canceled to order), v.f., cat. $1250 (Cat No. C46a) (Image)

Cat. $1250, Est.$500

1934 5k Usyskin, perf. 13 3/4, well centered, large margins all around, l.h. (if at all), v.f., cat. $135 (Cat No. C50a) (Image)

Cat. $135, Est.$100

1934 Airships, 10k lilac, block of four, upper left stamp l.h., others n.h., fine-v.f. (Cat No. C54) (Image)

Est.$250

1934 Airships, 20k black, block of four, n.h., v.f. (Cat No. C56) (Image)

Est.$250

1935 Chelyuskin Rescue, complete set, n.h. and post office fresh, 15k with a tiny gum disturbance (from mount), v.f., cat. $2058 (Cat No. C58-67) (Image)

Cat. $2058, Est.$1,000

1935 Moscow to San Francisco 1r on 10k (Levanevsky), variety showing incomplete Cyrillic "P" in fourth word from top, h.r., v.f., signed Goznak, cat. $500 (Cat No. C68) (Image)

Cat. $500, Est.$250

1935 1r on 10k dark brown (Levanevsky), Moscow-San Francisco, red overprint and surcharge, position 1, used 20.8.35 on registered and flown cover from Moscow to H.Rosenberg in Berlin, v.f., with arrival (29.8.35) pmk on back (Cat No. C68) (Image)

Est.$750

1935 1r on 10k dark brown (Levanevsky), Moscow-San Francisco, red overprint and surcharge, block of four, positions 1-2, 6-7, bottom pair small "f", stamps hinged at top and bottom, one with natural gum glazing, well centered, post office fresh, v.f., rare combination se-tenant block (Zverev $35,000) (Cat No. C68,68b) (Image)

Est.$15,000

1935 Moscow to San Francisco 1r on 10k (Levanevsky), two different, one with lower case Cyrillic "f", first one h.r., the latter n.h., but with tiny adhesion and faint overall toning, signed Goznak, cat. $2750 (Cat No. C68,6b) (Image)

Cat. $2750, Est.$750

1937 Jubilee Aviation Exhibition, 40k violet brown & black, vertical pair imperf. between, used (canceled to order), v.f. (Zverev $2,000) (Cat No. C72var) (Image)

Est.$500

1937 50k black & violet, vertical pair imperf. between, used, v.f. (Zverev $3,000) (Cat No. C73var) (Image)

Est.$750

1937 50k black & violet, vertical pair imperf. between, used (canceled to order), l.h., fine-v.f. (Zverev $3,000) (Cat No. C73var) (Image)

Est.$750