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:

1939, definitive issue, miner 5k red, perforation L12 1/2 instead of comb 12×12 1/2, block of four, full OG, NH, VF, Est. $150-$200, Scott #734 var