Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - Russia and Soviet Union - 1935, Moscow - San Francisco Flight, red surcharge 1r on 10k dark brown, position 2 of 25-stamp setting, full OG, LH, VF, Soviet Philatelic guarantee hs, C.v. $500, Est. $300-$325, Scott #C68