Union general (1819–1893) who commanded a division at Gettysburg and has controversially been credited with the invention of baseball. Ink signature, “A. Doubleday,” on an off-white 4 x 2 slip clipped from an endorsed document. In fine condition, with intersecting folds passing through the signature. Accompanied by an unsigned framed portrait. Pre-certified PSA/DNA and RR Auction COA.