Description:Walter Johnson autographed 1939 Centennial photographic cachet. Original June 12, 1939 First Day of Issue postmarked "Commemorating 100th Anniversary Of Baseball" cachet has been signed "Walter Johnson" in period fountain pen. The signature rates 8/9 out of 10. Cover itself has some light/mild toning/spotting and wear. Includes full LOA from JSA: Sig. NM, Cover VG/EX