GE 1912 Semi-Official Airmail, Gelber Hund. MI. IV F Plate Flaw

FVF used. 1912 One mark and "Gelber Hund" overprinted on the 10 pf. dark red-orange Semi-Official airmail for flights from Darmstadt to Frankfurt. Showing a stylized dove with a letter. Inscribed "First German Airmail" The stamp has a cancel from the flight. With plate flaw, "d" missing ascenter making hund appear to say huna.