Derrick Mason Autographed/Signed Pro Style Purple XL Jersey Beckett 35521 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 custom pro style purple XL jersey with sewn on name and numbers that was personally autographed by Derrick Mason. Includes a certificate of authenticity from Beckett Authentication Services (BAS) and Denver Autographs.