The 2021 Onyx Premium Auto Gold /25 Marcelo Mayer #OPMM Autograph RC is a highly sought-after sports trading card featuring the talented baseball player Marcelo Mayer. This single-insert card is part of the 2021 Onyx Premium set and is serial numbered, autographed, and classified as a rookie card. The card is a rare Gold parallel variety, making it a valuable addition to any sports memorabilia collection. Manufactured by Onyx Authenticated, Inc., this original card represents the Boston Red Sox team and is a must-have for fans and collectors alike.