Description:Rube Marquard single signed baseball c.1960s. J.DeBeer and Son "Vigorized" baseball has been signed "Rube Marquard" in fountain pen rating 8 out of 10. Ball displays mild toning to a coat of shellac applied long ago to aid in preservation. Includes auction LOA from JSA and letter of provenance from the Kennedy Family: Sig. NM, Ball EX