Add to Favorite Sellers. Mariano Rivera New York Yankees Autographed Black Leather Baseball – Fanatics Authentic Certified. This baseball has been personally hand-signed by Mariano Rivera. It has been obtained under the auspices of the Major League Baseball Authentication Program and can be verified by its numbered hologram at MLB It also comes with an individual numbered, tamper-evident hologram from Fanatics Authentic. Due to quantity levels, we do at times list a stock image of the product. This is done to standardize and expedite the listing process and only applies for merchandise that is comparably identical. Major League Baseball Authentication, Fanatics Authentic.