1939 Baseball Centennial first day cover, signed and inscribed by Hall of Famer Frankie Frisch, "The Old Flash." Postmarked Cooperstown, NY on June 12, 1939, the card was mailed to a fan in Eustis, FL. Frisch's signature is bold and clean, a slight bit of skipping of the ink. Authenticated and encapsulated by PSA/DNA.