Gelsenkirchen, Westphalia, to Berlin. A Hennig produced cover. Karl Hennig, a stamp dealer, produced many early flight covers. In 1919 the Deutsche Luft Reederei introduced air mail operations to Berlin. This route was discontinued in December 1920.
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New to my collection, this is Michel number H-blat 35, watermarked lozenges. Mint, never hinged.
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