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

Soviet Union 1923-40

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Start price: $200

Buyer's premium:

1927, black surcharge (type II) 8k on Postage Due stamp of 2k violet, basic stamp of typo printing on watermarked paper, right margin block of four, full OG, top stamps are hinged, bottom – NH, VF, Est. $400-$500, Scott #367 var