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

Soviet Union

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Start price: $600

Buyer's premium:

1937, definitive issue, peasant 20k green on pale blue network, horizontal imperforated pair on paper without watermark, full OG, NH, VF, C.v. $1,900, Est. $1,000-$1,200, Scott #617Ab