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

Soviet Union

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Start price: $100

Buyer's premium:

1940, Physical Culture GTO Program (Ready for Labor and Defence of the USSR), 50k dark violet blue, comb perforation 12½x12, raster vertical diamonds, three-side margin block of 50 (10×5), stamp on position 23 with a spot on ”0” in ”50”, representing several other printing varieties, folded once, full OG, NH, VF, C.v. $412, Scott #786, var