Credited with the invention of modern baseball, Doubleday was also the Union general who supposedly aimed the first gun on the Confederates. Ink signature, “A. Doubleday, Major Genl. Vol. U. S. Army,” on an off-white 4 x 1.5 lined slip, clipped from a larger document and affixed to a white 5 x 3 card. Some light corner toning from adhesive and small stamps to right edge, otherwise fine condition. COA Steve Grad/PSA/DNA and R&R COA.