1904-08 50k Offices in China, Russia (Vertical Watermark, Canceled, CV $350) (Image)

1904-08 50k Offices in China, Russia, Pair (Vertical Watermark, Shanghai Postmark, CV $700) (Image)

18XX (8 July) Urga, Mongolia cover addressed to Pekin, China, franked with 7k (Date-stamp Type 3c) (Image)

1916 (13 Dec) Urga, Mongolia cover addressed to Pekin, China, Vladivostok Censorship (Date-stamp Type 7a, Rare) (Image)

1929 (27 Feb) Republic of Mongolia cover from Ulan Bator to Harbin, China (Image)

1929 (30 Nov) Republic of Mongolia cover addressed from Altanbulak to Harbin, China (Image)

1931 (17 Nov) Republic of Mongolia, Urga (Ulan Bator) Local franked with pair of 5m with HARDLY shifted overprint (Image)

14k stamp used in Mongolia, 1917 Ugra cancellation, Russian Post Offices Abroad (Type 7a Date-stamp) (Image)

15k stamp used in Mongolia, 1917 Ugra cancellation, Russian Post Offices Abroad (Type 7a Date-stamp, NOT RECORDED) (Image)

20k stamp used in Mongolia, Ugra cancellation, Russian Post Offices Abroad (Type 7a Date-stamp, SHIFTED Background) (Image)

25k stamp used in Mongolia, 1917 Ugra cancellation, Russian Post Offices Abroad (Type 7a Date-stamp, Rare) (Image)

35k stamp used in Mongolia, Ugra cancellation, Russian Post Offices Abroad (Type 7a Date-stamp, UNPRICED) (Image)

35k stamp used in Mongolia, Ugra cancellation, Russian Post Offices Abroad (Type 7a Date-stamp, Rare) (Image)

50k strip used in Mongolia, 1917 Ugra cancellation, Russian Post Offices Abroad (Type 7a Date-stamp, Rare) (Image)

50k block, LARGEST recorded Multiple of this stamp used in Mongolia (Urga Type 7a Date-stamp, Signed, Rare) (Image)

70k stamp used in Mongolia, 1916 Ugra cancellation, Russian Post Offices Abroad (Type 7a Date-stamp, Rare) (Image)

70k pair used in Mongolia, 1916 Ugra cancellation, Russian Post Offices Abroad (Type 7a Date-stamp, Rare) (Image)

1r stamp used in Mongolia, Ugra cancellation, Russian Post Offices Abroad (Type 7a Date-stamp, Rare) (Image)

1r stamp used in Mongolia, Ugra cancellation, Russian Post Offices Abroad (Type 7a Date-stamp, Rare) (Image)

Group of 1908-1912 stamps used in Mongolia, Ugra cancellation, Russian Post Offices Abroad (Type 7b Date-stamp) (Image)

3.50r stamp used in Mongolia, Ugra cancellation, Russian Post Offices Abroad (Type 7b Date-stamp) (Image)

3.50r stamp used in Mongolia, Ugra cancellation, Russian Post Offices Abroad (Type 7b Date-stamp) (Image)

5r stamp of 1906 issue used in Mongolia, Ugra cancellation, Russian Post Offices Abroad (Type 7b Date-stamp) (Image)

Military Correspondence in the Russian Empire, Catalogue (Tyukov V. M.) (Image)

Russian Postmarks: an Introduction and Guide, Catalogue (Kiryushkin A. V., Robinson P. E.) (Image)