The 1981 Topps Seattle Mariners Team Checklist is a vintage baseball trading card featuring a single-insert design from the original 1981 Topps set. This card, manufactured by Topps, includes a checklist of players from the Seattle Mariners team for the 1981 season. It is a valuable collector's item for fans of Major League Baseball and the Seattle Mariners franchise, especially for those interested in vintage baseball trading cards.