1931 (June 6), C.N.A.C. Pioneer Flight cover on line Tientsin - Beijing, then via Siberia to Europe, addressed to Great Britain, franked by seven stamps of the 2nd Peking printing, including three of $1 values, tied by special flight circular markings, bearing red Berlin Zentral Luftpostamt transit handstamp, vertical fold, still F/VF and rare, Est. $300-$400 (Image)

1894, Princess Dowager, 9c green, vertical tete-beche pair with gutter strip at right, full OG, previously hinged, VF, C.v. $2,000 (Image)

1898, black surcharge (large format) $1 on 3c Red Revenue stamp, perfectly centered, large part of OG, previously hinged, VF and scarce, B. Walter Haveman certificate, C.v. $5,000 (Image)

1912, Dr. Sun Yat-sen, 1c-$5, complete set of 12, each one with black typo overprinted Specimen, hinge mounted on individual pieces, large part of OG, F/VF and rare (Image)

1912, President Yuan Shih-Kai, 1c-$5, complete set of 12, each one with black typo overprint Specimen, mounted by hinged on individual pieces, traces of OG, F/VF and rare (Image)

1949, Dr. Sun Yat-sen, Silver Yuan currency, 1c-500c, complete set of nine in horizontal pairs, creamy paper as often exists, no gum as issued, NH, F/VF, C.v. $2,084 (Image)

1935, Communications Day, 8½s-33s, souvenir sheet of four stamps, perfect quality, full OG, NH, VF, C.v. $2,000 (Image)

1935, Mt. Fuji, (1½s) rose carmine New Year stamp, miniature sheet of 20 (4x5), marginal imprints and two printer's crosses at left selvage, full OG, NH, VF, C.v. $700 as hinged, Sakura #N1, ¥180,000=US$1,200 (Image)

Zeppelin Flight. 1929 (August 23-29), Around the World Flight specially printed postcard to US, franked by nine stamps (two - on reverse), tied by Tokyo ''21.8.29'' ds, Japanese confirmation cachet, Lakehurst arrival machine marking of August 29, mostly VF and scarce, Sieger #31B, C.v. €800 (Image)

1926 (December 11), Soyombo 50m buff and black, used on registered cover from Ulaanbaatar to Linkoping via Siberia, bilingual date stamps and registration marking, handstamped ''50'' in Sweden for checking postal rate, VF and scarce (Image)

1928 (October 29), red-band cover from Tsetserleg to Kalgan, via Harbin, franked by Soyombo 5m and 20m on reverse, tied with boxed date stamps, uprated by Junk 4c olive green on front upon arrival to Harbin, some usual soiling, F/VF and rare (Image)

1929 (March 9), SovTorgFlot (Soviet Merchant Fleet) pre-printed envelope sent by registered mail from Ulaanbaatar to Germany, franked by Soyombo 50m buff and black, Leipzig ''27.3.29'' arrival marking, F/VF (Image)

1959, Mongolian Language Congress, 40m multicolored, right sheet margin horizontal pair, imperforate vertically between stamps and on the right, full OG partly missing on the selvage, NH, VF, Est. $150-$200 (Image)

1959, Congress of Rural Economy, 30m green, bottom left corner sheet margin single, imperforate on the left, full original gum partly missing on margin, NH, VF and scarce, Est. $150-$200 (Image)

Chinese stamps used in Mongolia. 1912 (September 26), red band cover from Urga to Kalgan, franked by vertical pair of Chinese Imperial Post 3c slate green, Kalgan arrival marking of October 5, mostly VF and scarce, expertized by Dr. Orth (Image)

1957, Crown of Nepal, 2p-2r, complete set of 12, blocks of four, seven of which with sheet margins, full OG, NH, VF, C.v. $440 as hinged singles (Image)

1950, Peasants 1w dark blue, six imperforate stamps, including block of four, both left stamps have damaged value ''1'' at left and all four values with unclear inscription at top, a single with large spot after left ''1'' and a common stamp, fresh, no gum as produced, NH, VF, C.v. $360 for common stamps (Image)

1949, North Korean Flag, 6w red and blue, rouletted 12, strongly misperforated horizontal strip of five, no gum as issued, NH, VF and a spectacular piece (Image)

1950, Order of the National Flag, 1w sage green, rouletted perforation, block of four, imperforate horizontally between stamps, no gum as issued, NH, VF and scarce (Image)

1954, Day of Anti-US Struggle, 10w red brown, imperforate single, full OG, NH, VF, C.v. $210 (Image)

CLEAN UNIT OF ORIGINAL ISSUES: 1950-54, 16 imperforate, rouletted or both stamps, 8 unused and 8 used, including unused Peasants (C.v. $60), General Pang (C.v. $60), Battle of 1953 (C.v. $110), Liberation from Japan (C.v. $50) and more, nice and fresh unit, unused stamps mostly have no gum, NH, VF, C.v. $692 (Image)

1967, 10th Anniversary of the Soviet Space Satellite, 10ch multicolored, top right corner sheet margin unissued stamp, full OG, NH, VF, C.v. $1,500 (Image)

1969, Youth Chess Championships of Socialist Countries, 10ch multicolored, top left corner sheet margin unissued stamp, full OG, NH, VF, C.v. $1,000 (Image)

1971, Asia-Africa Table Tennis Games, 10ch multicolored, top right corner sheet margin unissued stamp, full OG, NH, VF, C.v. $750 (Image)

1971, Butterflies, 10ch in different colors, unissued complete set of three, all are bottom right corner margin singles, full OG, NH, VF, C.v. $2,500 (Image)