Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2

Soviet Union 1923-40

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Start price: $100

Buyer's premium:

1929, Pioneer’s Assembly, 10k brown and 14k slate gray, complete set in horizontal pairs, used on registered cover from Kharkov to England, blue crayon cross as always on registered mail, F/VF, Est. $200-$250, Scott #411-12