Postal cover with a cachet honoring the Flying Fortress at the Biggin Hill Air Fair, signed in ink by seven: Gerd Barkhorn, Erich Hartmann, [Karl] Dönitz, Adolf Galland, Albert Speer, Otto Kretschmer, Kurt Tank, and one other. In fine condition, with just a touch of handling wear and very faint haloing to Galland. R&R COA.