Rare Liberty Bell 7 launch cover with a cachet honoring the Project Mercury program, and canceled July 21, 1961, Patrick Air Force base, for Grissom's flight, signed in black ink, “Virgil I. Grissom,” and also signed by fellow Mercury astronaut Scott Carpenter. In fine condition, with a light block of toning to lower right from a previously affixed label. Pre-certified Steve Zarelli and RR Auction COA.
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