FDC with a cachet honoring the cessation of nuclear testing, postmarked at the United Nations in New York City on October 23, 1964, signed above in black ballpoint, "Charles W. Sweeney, Pilot, Nagasaki, 9 Aug. 45." In fine condition. Encapsulated in a PSA/DNA authentication holder, grading the autograph as "NM 7.”
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