Bidspirit auction | Worldwide Aerophilately - Brazil

Worldwide Aerophilately - Brazil - Air Post Semi-Official issues: 1930, stamps for Graf Zeppelin First South America Flight, the fourth set, black overprints ''Graf Zeppelin. USA'' on 5000r-20,000r, properly cancelled, mostly VF, expertized by W. Tust, C.v. $600 , Sc. #4CL8-10