The 1990 Upper Deck Gregg Olson #604 is a baseball trading card featuring the player Gregg Olson from the Baltimore Orioles. Produced by Upper Deck as part of their 1990 set, this card is a base set variety and is a must-have for collectors of Major League Baseball memorabilia. With its iconic design and representation of a talented athlete from the 1990 season, this trading card is a valuable piece of sports history.