Harmon Killebrew Signed Minnesota Twins American League Baseball JSA 31009 The number in the listing title is just an inventory sku for our records and is not the authentication number. This is an American League baseball that was personally autographed by Harmon Killebrew. This is the exact item that you will receive so please see scans for condition. Includes a certificate of authenticity from James Spence Authentication (JSA) and Denver Autographs.