Description:Gabby Hartnett single signed baseball c.1960s. J.DeBeer and Son "Semi-Pro League" baseball has been signed on the side panel, "Leo Gabby Hartnett." Ink signature rates 7/8 out of 10. Ball displays mild toning/discoloration and some light surface wear throughout. A coat of shellac was applied long ago to aid in preservation. Includes auction LOA from JSA and letter of provenance from the Kennedy Family: Sig. EX/MT-NM, Ball VG/EX