German Empire 1912/1913 - 3点の珍しいツェッペリン／航空のパイオニアに関する資料

Three rare Zeppelin/pioneer aviation covers from the Deutsches Reich, dating 1912–1913, in Bedarfspost condition, including a Rhein/Main airmail card with 3×30pf green from Darmstadt (23 June 1912), a Darmstadt card with 2× yellow dog (18 June 1912), and the first German airmail card on the Rhine with a Zeppelin military airship from Düsseldorf (20 April 1913).