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, triple black (one inverted) diagonal surcharge 7500r on 250r violet, block of four printed on ordinary paper, one normal surcharge of light impression appears to be brown, full OG, NH, VF, I. Kirzhner certificate, Est. $400-$500 , Sc. #201 var