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, complete set of three in sheet margin blocks of four, high value block has minor gum toning, full OG, NH, VF, each stamp with expert's hs, C.v. $2,900++, Sc. #4CL8-10