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

Soviet Union of 1923-40

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Start price: $75

Buyer's premium:

1933, Leningrad Philatelic Exhibition, red surcharge 30k on 15k black brown, no dot after ”1933” variety (position 14 or 66), full OG slightly yellowing at bottom, NH, VF, Est. $100-$150,Scott #487 var