MARIANO RIVERA signed 1999 WORLD SERIES OML baseball JSA COA YANKEES. These are same balls as used on the field during games. The signature was obtained in person and has already been authenticated by James Spence Authentication or JSA, so you know you're purchasing an authentic item. Anywhere else in the world please message me for a quote. Please message me with any other questions regarding this item, and I will reply promptly.Thanks for looking and please check out my other great items! Powered by SixBit's eCommerce Solution. The item "MARIANO RIVERA signed 1999 WORLD SERIES OML baseball JSA COA YANKEES" is in sale since Friday, May 22, 2020. This item is in the category "Sports Mem, Cards & Fan Shop\Autographs-Original\Baseball-MLB\Balls". The seller is "tek29603" and is located in Warrington, Pennsylvania. This item can be shipped to United States, Canada.