Flown limited edition commemorative cover, 9.5 x 4.25, #927/1500, with a cachet honoring the 12 X-15 pilots, signed on the front in pencil by five of the pilots: Scott Crossfield, Robert M. White, Bill Dana, William J. Knight, and Joe Engle. Cover was flown by Engle on the 40th Anniversary of the plane. In fine condition. RRAuction COA.
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