Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - Russia And Soviet Union - 1935, Moscow - San Francisco Flight, significantly (2mm) shifted to the left red surcharge 1r on 10k dark brown, small ''f'' variety, position 6 of 25-stamp setting, unused, no gum, VF appearance, signed H. Bloch, C.v. $1,500 as hinged, Est. $500-$600, Scott #C68b