Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 969:
1925-36, Academy of Sciences, Popov, Decembrist Revolt, Revolution of 1905, Esperanto, Zamenhof and Pioneers Helping Post (perf 11), the total is 23 stamps, all with full OG, NH, mostly VF, C.v. $484, Scott #326/588a
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