Description:Harmon Killebrew single signed Home Run "#565" attributed baseball. Spalding L.MacPhail Official American League baseball has been signed "Jack - My Sincere Regards + Thanks! Harmon Killebrew" on the side panel in ink rating 7/8 out of 10. A notation on the opposite side reads "May 23 - 75, #565, Balt. in K.C. Grimsley 1st inning." Ball displays soiling and expected use/wear. McKeon was then Managing the Kansas City Royals when Killebrew hit the homerun which advanced him closer to his career total of (573). Includes auction LOA from JSA and letter of provenance from Jack McKeon: EX-NM