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

Soviet Union 1923-40

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Start price: $250

Buyer's premium:

1935 (October 26), Baku Commissars, 4k-40k, complete set of five, used on registered air mail cover from Moscow to Bulgaria, Moscow ds cancellations and all appropriate markings, Sofia ”06.11.35” arrival hs, VF and scarce complete set franking, Est. $500-$600, Scott #519-23