Bidspirit auction | Worldwide Aerophilately - Latvia

Worldwide Aerophilately - Latvia - 1933-36, Airplanes and Graf Zeppelin, two flown registered covers from Riga to Germany or England, franked by perforated or imperforated complete sets of four respectively, all appropriate markings and arrival ds, VF, C.v. $700 as used stamps off cover, Sc. #CB21-24, a