Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - Russia And Soviet Union - First and Pioneer Flights - 1924 (June 11-12), Pioneer Flight Philatelic Exchange registered cover from Moscow to NYC via Koenigsberg and Berlin, franked by complete set of Air Post surcharges with extra 10k/5r on reverse, made correct postal rate of 60k (International Letter - 20k, Registration - 20k and Air fee to Germany - 20k), exchange stamp of 3k/3r tied by official hs and bearing real signature of F. Chuchin - Soviet Philatelic Authority, F/VF, Est. $200-$250, Scott #C6-9