1909 (28 Dec) red-band cover from Urga to Kalgan, franked with four Russian 7k dark blue, each tied by appropriate "Urga Mongolia Zag. Pocht. Kont." double-ring cds, repeated alongside, Cyrillic "to Kalgan" and "Dun Fu Yu" handstamps, 5 Jan 1910 arrival and numerous red chops on reverse, fine and rare cover (Image)

Est.$2,000

1909 red-band cover (opened for display) from Urga to Kalgan, franked with single Russian 7k dark blue, tied by "Urga Mongolia Zag. Pocht. Kont." double-ring cds, repeated alongside, Cyrillic "to Kalgan Ko Fan" handstamps, 8 June 1909 arrival and numerous red chops on reverse, fine and rare cover, with 2011 BPA certificate (Image)

Est.$1,000

1927 1m (3, including a vertical pair and a single), 5m vertical pair and 10m (small defect), used on cover (slightly reduced at right) from Ulan Bator (12 Oct 27) to London, filing folds away from the stamps, signed "N.Y. Stamp Co." (Cat No. 34,36-37) (Image)

Est.$500

1927 1m, 2m (2), 5m (2 including one on back), 10m and 25m (overlapping), used in 1928 on registered cover from Ulan Bator to Moscow, handstamped Registry with number filled in by hand, fine cover, with arrival pmks (Cat No. 34-39) (Image)

Est.$750

1927 25m yellow and black, tied by Ulan Bator (10 Sep) cds on back of native cover to China, with 4c Junk added as postage due on arrival in Kalgan, red "Manchurskaya Kitajskaya Kontora", plus additional red chops, Chita transit and additional arrival pmks, fine and scarce usage (Cat No. 39) (Image)

Est.$750

1931 5m on 5c brown violet and 20m on 20c bister brown, tied by Ulan Bator cds on back of a red-band cover used in 1932 to China, with 20c and 30c Postage Dues applied on arrival in Kalgan, usual slight gum stains, otherwise fine, signed Holcombe (Cat No. 59,61) (Image)

Est.$1,200

1931 5m on 5c brown violet and 10m on 10c green horizontal pair, tied by Ulan Bator cds on back of a native cover used in 1932 to China, with two 30c Postage Dues (including one with sheet margin) applied on arrival in Kalgan, usual slight gum stains, otherwise fine (Cat No. 59-60) (Image)

Est.$1,200