Limited-edition flown commemorative cover honoring the X-15 Rocket Pilots, #571/1500, flown over Edwards AFB by X-15 pilot Joe Engle, signed in pencil by Robert White, Bill Dana, Joe Engle, Pete Knight, and Scott Crossfield. In fine condition. Accompanied by an informational cardstock sheet entitled, ‘Celebrating the 40th Anniversary of the X-15.’ Pre-certified Steve Zarelli and RR Auction COA.
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