Commemorative cover, 6.5 x 3.75, bearing a cachet honoring Knight’s record flight in an X-15 and an Edwards, California 1967 postmark, signed in black felt tip by Knight, adding “4520 mph, October 3, 1967, Edwards AFB.” Cover is attached by corner tabs to an 8.5 x 11 presentation sheet. In fine condition. COA Scott Cornish and R&R COA.
