Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 1
Lot 92:
1935, Moscow – San Francisco Flight, red surcharge 1r on 10k dark brown, small ”f” in San Francisco variety (position 7), large part of OG (gum lost at bottom left corner), VF, Soviet Philatelic guarantee hs, V. Zagorsky certificate, C.v. $1,500, Est. $700-$800, Scott #C68b
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