Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 3
Lot 1120:
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
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