Rex Kern Autographed/Signed 1988 Kroger Trading Card PSA Slab 43774 The number in the listing title is just an inventory sku for our records and is not the authentication number. The item pictured is a stock photo unless otherwise noted. This is a trading card that was personally autographed by Rex Kern. This has been professionally slabbed by Professional Authentication Services (PSA) and includes a certificate of authenticity from Denver Autographs.