Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 3
Lot 1244:
1927, 40th Anniversary of Esperanto, pre-printed envelope, representing portrait of Dr. Zamenhof and non-postal stamp of World Esperanto Congress in Gothenburg, sent from Sestroretsk (Leningrad Obl.) to Hamburg, franked by definitive stamp of 8k green in horizontal pair, flap is missing, still fine, Est. $100-$150, Sc. # 389
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