Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1

Worldwide Air Post Stamps and Postal History - RSFSR and Soviet Union

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Start price: $400

Buyer's premium:

1935, Moscow – San Francisco Flight, red surcharge 1r on 10k dark brown, small ”f” variety of surcharge (position 6), used on registered cover from Moscow to Vienna (February 19, 1937) together with Ethnographic stamp of 20k gray, appropriate markings, no backstamp as always exists, VF and very scarce, Est. $800-$1,000, Scott #C68b