Navigator (1920-2004) of the 'Straight Flush,' one of seven planes of the 393rd Bomb Squadron of the 509th Composite Group that took part in mission to drop the world's first atomic bomb on Hiroshima. FDC with a cachet honoring the golden anniversary of aviation, signed "Capt. Francis D. 'Felix' Thornhill, Navigator 'Straight Flush,' 509th Bomb Group, USAF." In fine condition. Encapsulated in a PSA/DNA authentication holder, grading the autograph as "GEM MT 10."