Commemorative cover with a cachet honoring launch of the Challenger, signed in black felt tip by Guion Bluford, William Thornton (autopen signature), Dan Brandenstein, Richard Truly, and Dale Gardner, and signed in black ballpoint by Thornton, signed “W. Thornton (By Hand).” In fine condition, with a small rectangular area of adhesive residue at the top left corner barely touching Thornton’s second signature. Pre-certified Scott Cornish and RRAuction COA.
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