First baseball commissioner, appointed in 1921 after the “Black Sox” scandal. Vintage fountain pen signature, “K. M. Landis,” on an off-white 2.5 x 2.25 slip, clipped from a program, with Landis’ portrait next to signature. Slip is housed in a PSA/DNA protective case. Some light toning and wrinkling, otherwise fine condition. COA Steve Grad/PSA/DNA and R&R COA.