Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 3

RSFSR Issues 1918-23

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Start price: $250

Buyer's premium:

1922-23, litho ”Star” surcharge 5r on imperforated 20k blue and carmine, vertical gutter block of four, full OG, NH, VF and scarce positional multiple, Est. $400-$500 , Sc. #223 var