Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 1

Worldwide Air Post Stamps and Postal History - Soviet Union

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Start price: $250

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1935, Moscow-San Francisco Flight, red surcharge 1r on 10k dark brown, position 2 of 25-stamp setting, very well centered, full OG, LH, VF, Soviet Philatelic guarantee, L. Hovest certificate, C.v. $500, Est. $400-$500 , Sc. #C68