Heavyweight boxing champion of the world, 1899–1904. Fountain pen signature, “Jas. J. Jeffries,” adding a list of three of the best boxers he has seen “Corbett-James J., Ryan-Tommy and Griffo - Young,” on an off-white 5.25 x 3.25 card. In fine condition, with several small blocks of toning, show through from cancellation, mounting remnants to corners and several collector’s notations including date and list explanation. COA Steve Grad/PSA/DNA and R&R COA.