Jay Berwanger Autographed University Of Chicago Index Card Beckett Slab 37616 The number in the listing title is just an inventory sku for our records and is not the authentication number. This is the exact item that you will receive so please see pictures for condition. This is a index card that was personally autographed by Jay Berwanger. This has been professionally slabbed by Beckett Authentication Services (BAS) and includes a certificate of authenticity from Denver Autographs.