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

Soviet Union 1923-91

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Start price: $200

Buyer's premium:

1991, Marine Life, Dolphin, 20k multicolored, right sheet margin imperforate block of four, control lights on selvage, full OG, NH, VF, Est. $400-$450, Scott #5958 imp