Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 3

RSFSR Issues 1918-23

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1921, 4th Anniversary of the October Revolution, 100r, 200r (unissued), 250r and 1000r, complete set of four, all with corner or sheet margins, full OG, NH, VF, Scott #188-90, fn