Bidspirit auction | Worldwide Aerophilately - Germany

Worldwide Aerophilately - Germany - Air Post Semi-Official stamps: 1912, Rhine-Main Air Mail, 10pf-30pf and ''Gelber Hund'' dark blue surcharge 1m on 10pf red orange, full OG, mainly LH, VF, surcharged stamp expertized by H. Bloch and H. Grabowski, C.v. $484, Michel #I-III, IV, €670, Sc. #CL1-3, CL4