Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - Russia And Soviet Union - 1924, Fokker F.III, black surcharges 5k/3r-20k/10r, complete set of four, bottom sheet margin blocks of six (3x2), full OG, NH, VF, C.v. $315++, Est. $300-$350 , Scott #C6-9