Authenticator pre-certified authenticator: upper deck authenticated history of item: steve kerr has signed this item in the presence of a representative from upper deck authenticated. describe how you came to possess this item: super sports center is a fully authorized retailer for upper deck authenticated. other information about you and / or the item: super sports center strives to deliver the most authentic in sports memorabilia from trusted companies like upper deck authenticated, panini authenticated, beckett authenticated and fanatics authenticated.