Flown limited edition commemorative cover, 9.25 x 4, with a cachet honoring the X-15 rocket pilots, 1113/1500, flown over Edwards Air Force Base by Joe Engle, signed in pencil by Robert White, Bill Dana, Joe Engle, Scott Crossfield, and William ‘Pete’ Knight. In very fine condition. Pre-certified Steve Zarelli and RR Auction COA.
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