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:

1927, black surcharge (type II) 8k on Postage Due stamp of 2k violet, basic stamp of typo printing on paper without watermark, perforation 12, left margin block of four, full OG, top stamps are hinged, bottom – NH, VF, Est. $200- $300, Scott #36 var