Graded POOR 1 by PSA with an (mk) qualifier due to a reverse owner's stamp. Class of 1936 Hall of Famer Christy Mathewson deals on the offered 1909-1913 M101-2 Sporting News Supplement. Published August 5, 1909, this heirloom pictures the New York Giants ace warming up against a century-old ballpark setting. Reverse paper pulling along each corner accounts for Matty's overall assessment. Only a dozen total examples have been judged by the authenticator. Opening Bid $400.