Early FDC with a cachet honoring the International Geophysical Year of 1957-1958, postmarked in Chicago on May 31, 1958, signed vertically along the left border in black ink, "Virgil I. Grissom." In fine condition. Accompanied by two Gus Grissom autograph cards, one of which bears a facsimile signature, and the other a secretarial signature.
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