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

RSFSR Issues 1918-23

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Start price: $100

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1922, black diagonal surcharge 100,000r on 250r violet, basic stamp of typo printing, left sheet margin block of four, full OG, NH, VF, Est. $200-$250,Scott #210 var