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

RSFSR Issues 1918-23

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Start price: $250

Buyer's premium:

1922-23, litho “Star” surcharge 5r on imperforate 20k blue and carmine, block of four with vertical gutter in the middle, full OG, NH, VF and scarce multiple, Est. $500- $600 ., Scott #223 var