Commemorative cover bearing a cachet honoring the 50th anniversary of the Dryden Flight Research Center, signed in black ink by X-1 pilot Chuck Yeager, B-29 drop X-1 pilot Bob Cardenas, and P-80 chase pilot Bob Hoover. In fine condition with light haloing to Cardenas’s signature. Accompanied by a card describing the Dryden Flight Research Center. RRAuction COA.
