Commemorative cover, 6.5 x 4.25, with a cachet honoring The Royal Air Force Hendon Museum with a good deal of imprinted German text, signed “Willy Messerschmitt” in black ink. Also signed in blue ink by Adolf Galland, Gerhard Barkhorn and in black ink by Erich Hartmann. In fine condition, with small label affixed to lower right. R&R COA.
