Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 3
Lot 1240:
1926, International Esperanto Congress, 7k and 14k, complete set of two and a single of 7k, used on front and reverse respectively of registered cover sent from the Congress to Germany, tied by green ”10.8.26” special date stamp, Leipzig ”15.8.26” arrival marking on the back, mostly VF, Est. $150-$200, Sc. # 347-48
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