The 2007 SP Authentic By the Letter Signatures trading card featuring Adrian Gonzalez is a highly collectible item with a limited print run of only 50 copies. This autographed card, signed by Adrian Gonzalez himself, is a valuable addition to any baseball card collection. With its unique By the Letter Signatures insert set and serial numbering, this card offers a special and exclusive piece of memorabilia for fans of the San Diego Padres and Major League Baseball.