Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - Russia And Soviet Union - First and Pioneer Flights - 1922 (September 4), Pioneer Flight cover from Moscow to Berlin with Koenigsberg connection, franked by nine 10r carmine, yellow and gray (met 90k postal rate plus air fee to Berlin), German ''Mit Luftpost'' and boxed ''B1'' arrival on front, F/VF, Est. $200-$250