1927-30, International Air Post Conference and Zeppelin issue, three complete sets of two, last ones with perforation 12½ and 10½, full OG, NH, VF, C.v. $632.50 (Image)

1931, Airship over the Arctic Region, 50k dark gray blue, error of color, centered to the top, perfect condition, full OG, NH, fine, C.v. $900 (Image)

1932, Airship over the Dnieper Dam, 15k gray black, engraved printing, perforation 12 1/2, complete sheet of 40 (5x8), post office fresh quality, full OG. NH, VF, C.v. $480++ (Image)

1931, Zeppelin and Ice-Breaker ''Malygin'', 30k-2r, imperforated and perforated (comb 12x12½ ) complete sets of four, the last one with rough perforation as always, full OG, NH, F/VF, C.v. $687 (Image)

1932, International Polar Year, 50k carmine and 1r green, complete set of two, perforation 12 and 1r with perforation 10½, all have perfect centering, full OG, NH, VF, C.v. $390 (Image)

1933, Stratostat ''USSR 1'', 5k-20k, complete set of three, post office fresh quality, full OG, NH, VF, C.v. $463 (Image)

1933, Stratostat ''USSR 1'', 5k, 10k and 20k, complete set of three, full OG, mainly LH, VF, C.v. $310 (Image)

1934, Airships and Dirigibles, 5k-30k, complete set of five, completely flawless item, full OG, NH, VF, C.v. $1,020 (Image)

1935, Chelyuskin Rescue, 1k-50k, complete set of ten, nicely centered and post office fresh, full OG, NH, VF, C.v. $2,058 (Image)

1935, Flight Moscow - San Francisco, red surcharge 1r on 10k dark brown, position 4 of 25-stamp setting, full OG, LH, VF, Soviet Philatelic guarantee hs, C.v. $500 (Image)

1937, Aviation Exhibition, 10k-1r, complete set of seven and souvenir sheet of four stamps of 1r, all with full OG, NH, VF, C.v. $624 (Image)

1938, North Pole, 1st and 2nd Trans-Atlantic Flights and Papanin's Expedition to North Pole, four complete issues, the total is 15 stamps, full OG, NH, VF, C.v. $322 (Image)

1938, Balloons and Airplanes, 5k-1r, complete set of nine, perfect quality, full OG, NH, VF, C.v. #249 (Image)

Air Post Official stamps. 1922, red surcharges on Consular stamps, 12m/2.25r - 1200m/3r, complete set of seven without 1200m/50k, all are bottom right corner sheet margin singles except the high value (partly separated bottom margin), each one has surcharge of type III and originated from position 25, full OG, LH or previously hinged, minor marginal separation mentioned, VF and very rare matched set, Est. $4,000-$5,000 (Image)

Goznak Die Proofs. 1982, definitive issue, Kremlin Tower, die proof of 45k in brown, size 100x120mm, printed on wove paper without gum, VF and very rare, Est. $500-$600 (Image)

Goznak Die Proofs. 1983, 200th Anniversary of the birth of Simon Bolivar, sunken proof of the central engraved design of (6k) in black, artist A. Tolkachev, size 120x94mm, printed on stamp gummed paper, traces of hinges, still VF and rare, Est. $400-$500 (Image)

Important Postal History Items. RSFSR - SOVIET UNION MIXED FRANKING COVER: 1923 (December 3), cover from Novocherkassk (Don Obl) to Dresden, franked by three RSFSR definitives (two on reverse) and six Soviet Union values (all on reverse), all appropriate markings, Dresden ''12.23.12'' date stamp cancellation on all RSFSR adhesives (they were not cancelled in Novocherkassk), mostly VF, N. Mandrovski certificate, Est. $500-$600 (Image)

Lenin Mourning Issue. 1924 (January 29), 3k-20k, complete set of four, 3k and 20k are wide frame, 6k and 12 k narrow frame, used on philatelic bilingual advertising cover from Moscow to Leningrad, sent just 8 days after Lenin's death and 3 days after renaming Petrograd to Leningrad, Petrograd arrival ds of January 31, VF and a beautiful item, Est. $200-$250 (Image)

Lenin Mourning Issue. 1924 (February 17), 3k-20k, complete set of four with wide frame (12k and 20k on reverse), stamp of 3k with pin on tie variety, used on registered cover from Povenets (Olonets Gub.) to Kovno (now Kaunas), postmarked on arrival (February 24), mostly VF and scarce variety on a postal history item, Est. $200-$250 (Image)

Lenin Mourning Issue. 1924 (April 18), 6k red and black, medium frame, used on postcard (view of Cathedral of Christ the Saviour before it's ruined in 1931) from Moscow to England, insufficiently franked and uprated by British dues of ½p and 1p along with French manuscript ''T30c'' and ''1½d'' hs, mostly VF and scarce, Est. $200-$250 (Image)

Lenin Mourning Issue. 1924 (May 7), 20k red and black, horizontal pair with narrow frame, used on registered philatelic exchange cover from Kharkov to Montreal, uprated by three black surcharges 1k/1r brown with buff network (two - on reverse), perf 12½, tied by red boxed 7-line official cachet, arrival ds is on reverse, VF and very scarce, Est. $300-$400 (Image)

Lenin Mourning Issue. 1924 (November 10), 3k-20k, imperforate complete set of four (3k wide frame, others - medium frame), used on registered cover from Moscow to Berlin, arrival ''14.11.24'' ds on reverse, minor soiling, still VF, Est. $150-$200 (Image)

Lenin Mourning Issue. 1929, 20k red and black, medium frame, used together with two other values on registered philatelic exchange cover from Moscow to Basrah (then Mesopotamia), tied by Moscow ''17.4.29'' ds, exchange stamp of 5k/100r on reverse, Istanbul ''24.AVR.29'' transit and Basrah ''16.MAY.29'' arrival markings, red cross a always on registered mailings addressed to British Commonwealth, mostly VF, Est. $150-$200 (Image)

Lenin Mourning Issue. 1931 (December 20), large size Special Delivery cover from Moscow to Berlin-Siemensstadt, franked altogether by 31 stamps, including 7 perf or imperf of the Mourning issue, perf Lenin Mausoleum of 1925, air post surcharges of 1924 and etc., Berlin ''23.12.31'' arrival ds, mostly V and a spectacular piece, Est. $300-$400 (Image)

Pioneer Flights. 1924 (May 23), Moscow - Koenigsberg - Berlin Flight registered cover forwarded to Paris by connected flight, franked by Lenin Mourning issue perforated complete set in horizontal pairs, tied by Moscow ''23.5.24'' ds, two-line boxed Koenigsberg ''Mit Luftpost...'', Paris ''27.5.24'' arrival marking, slight traces of previous mounts, still F/VF and probably unique franking, Est. $500-$600 (Image)