Both signed in blue marker by their pictures, Koosman signed in a darker blue. Older cert from when they still put "Trading Card" on the slab when a card grade wasn't requested, we do guarantee that the card is authentic. We can't guarantee a number grade on the card if resubmittedbecause there is a Nolan Ryan authentic sticker on the back. The card also has mildew on the back and other signs of moisture damage.