Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 845:
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, Est. $500-$600, Scott #125
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