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

RSFSR Issues 1918-23

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Start price: $50

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1922, 250r violet, three horizontal tete-beche pairs, printed on ordinary paper with left or right stamp inverted or on thin paper (left stamp inverted), all with full OG, NH, VF, C.v. $145,Scott #183a, d