Joe Montana & Dak Prescott 2017 Idolized Classics Trading Card BAS 10 Slab 32779 The number in the listing title is just an inventory sku for our records and is not the authentication number. This is a 2017 Idolized Classics trading card that was personally autographed by both Joe Montana and Dak Prescott. This has been professionally slabbed by Beckett Authentication Services (BAS) and includes a certificate of authenticity from Denver Autographs.