Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - Germany - 1912 (July 25), Gotha, 10pf violet blue, signed by ''E. Schlegel'' (flight engineer), used together with Germany 5pf green on postcard from Erfurt to Zella-Mehlis and forwarded to Gotha, ''Respinto'' (Rejected) label in green, mostly VF, Michel #5, €1,100, Est. $400-$500