Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 847:
1928 (October 29), red-band cover from Tsetserleg to Kalgan, via Harbin, mixed franking of Soyombo 5m and 20m (on reverse) and Chinese Junk 4c olive green (on front, uprated upon arrival to Harbin), tied by various postal markings, some usual soiling, F/VF and rare, Est. $500-$600, Scott #32, 33
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