Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 2
Lot 1057:
1921, blue surcharge 20,000r on Romanov Dynasty 5r dark brown, the ”key” stamp, used on cover from refugees’ camp in Constantinople to refugees’ camp in Khalki II, appropriate markings, VF and probably unique cover, C.v. $950 for unused stamp, Est. $500-$600, Scott #261A
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