The 2023 Panini Chronicles Characters of the Game Marcelo Mayer Auto 3/50 #COG-MM is a highly collectible sports trading card featuring the autograph of Marcelo Mayer, a promising player from the Boston Red Sox. This limited edition card is part of the exclusive 2023 Panini Chronicles set, with a print run of only 7 copies and a special FOTL parallel variety. With its hard-signed autograph and serial numbering, this card is a valuable addition to any baseball card collection, offering fans a unique opportunity to own a piece of memorabilia from a rising star in the sport.