One of the finest Babe Ruth & Lou Gehrig Dual signed baseballs on earth. The ball is an official National League (John Heydler) Baseball that was produced in 1927. They signed the ball during their historic 1927 season. Most likely signed at the 1927 World Series since it's on a National League ball and that's the only time during the season that they would have used that ball. Comes with full letter Certificate Of Authenticity from James Spence JSA. Both signatures can be seen at the same time. A truly magnificent piece.