Scarce air mail cover, 6.5 x 3.75, bearing a signed cachet stamp from a Project Mercury station director in Mexico, postmarked twice in Guaymas, Mexico, on May 15, 1963, the date of Gordon Cooper’s Mercury-Atlas 9 mission, signed vertically along the left edge in blue ink by Gus Grissom, who served as a capsule communicator during the Faith 7 flight. In fine condition.
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