Incredible Abner Doubleday autograph with 5x7" engraving based on image by Mathew Brady. Underneath Doubleday's name, the inscription reads, "Bot. Brig. Genl. U.S.A., late Major Genl. of Vol." Doubleday, a war hero from the Civil War, was erroneously credited with inventing the game of baseball by the Mills Commission in 1908. PSA/DNA NM 7.