This is a Bill Mazeroski autographed baseball, graded by 3D Grading. The authenticity of the signature has been verified, and the ball is guaranteed to be original. The signature is located on the sweet spot of the ball, and it comes with a COA (Certificate of Authenticity) from 3D Grading. Bill Mazeroski is a Hall of Famer and played for the Pittsburgh Pirates. This is a great piece of memorabilia for any baseball fan, especially those who love the Pirates.