This baseball card showcases Carlos Guillen's signature, the former player for Detroit Tigers and Seattle Mariners. It is part of the 1998 Fleer Tradition Update set and is signed in a hard format. Beckett Authentication Services (BAS) has verified its authenticity with the authentication number 00016508913. Made of card stock material, this officially licensed trading card is encapsulated with the card number U40. The signature, in English, bears Carlos Guillen's autograph. For collectors of baseball memorabilia, this is a must-have item and a noteworthy addition for fans of the Detroit Tigers and Seattle Mariners. Autographed in Blue Sharpie. Carlos Guillen Autographed Seattle Mariners 1998 Fleer Tradition Update Baseball Card #U40. BAS experts have authenticated and encapsulated this signature. Certificate Number 00016508913.