Ball was signed in 2003 by Rivera as a special achievement of the Yankee's franchise for the 100th year in MLB from 1903-2003. Very rare and unique item that would be a great addition to any collection, especially a Yankee fan. Mariano Rivera is probably the best closer of all time but when he retires in a few years he's sure to be a first ballot Hall of Famer too. COA is from one of the best companies in the business, GAI. I have between 30-40 autographed baseball's available so if your in the market for multiple listings feel free to send me an email and i'll apply the discount of 10% off your 2nd item and 15% for the 3rd.