1923 1r, 5r and 10r, three imperf. panes of 25, n.h., v.f. (Cat No. C2,4,5) (Image)

Est.$500

1924 15k on 1r red brown, surcharge inverted, large margins all around including sheet margin, lightly hinged, fresh and v.f., signed Mikulski, Dr.P.Jem, etc. (Zagorsky 61Ta) (Cat No. C8a) (Image)

Est.$1,500

1930 50k gray blue (error), n.h., exceptionally well centered, v.f., cat. $900 (Cat No. C23a) (Image)

Cat. $900, Est.$500

1931 50k gray blue (error), left sheet margin block of four, exceptionally well centered for this issue, n.h. and post office fresh, v.f. and splendid block, signed Mikulski (Zverev $25,000) (Cat No. C23a) (Image)

Est.$7,500

1934 Civil Aviation, 10k green, corner margin horizontal pair imperf. between, used, few natural wrinkles, v.f., cat. $1250 (Cat No. C46a) (Image)

Cat. $1250, Est.$650

1934 Airships, complete set of five, tied by Jan 31 cds on registered cover, flown in 1935 from Moscow to Germany, fine-v.f., with arrival (Feb.4) on reverse (Cat No. C53-57) (Image)

Est.$1,000

1935 Chelyuskin, selection of seven blocks of four, some with sheet margin, 1k orange and 3k red vertical and horizontal watermarks each, also 5k (vertical), 15k and 20k horizontal watermarks, n.h., occasional minor gum disturbances, mostly fine-v.f. (Image)

Est.$1,000

1935 Moscow-San Francisco 1r on 10k Levanevsky, raised stop after "Ceb", h.r., v.f., signed Goznak, cat. $725 (Cat No. C68) (Image)

Cat. $725, Est.$250

1935 Moscow-San Francisco flight, 1r on 10k, lower case Cyrillic "f", n.h., v.f., pencil signed, cat. $2250 (Cat No. C68b) (Image)

Cat. $2250, Est.$1,000

1937 Jubilee Aviation Exhibition, 20k variety imperf. at left, used, v.f. (Zagorsky 474Pc, 70,000rub) (Cat No. C70var) (Image)

Est.$400