1989 UPPER DECK MARK McGWIRE #300

1989 · UPPER DECK · #300

This is a 1989 Upper Deck Mark McGwire base card graded PSA 9 Mint. Upper Deck's inaugural 1989 set revolutionized the hobby with its premium card stock and hologram security feature. As a key star in a historically significant set, high-grade copies like this PSA 9 maintain steady demand among player and era collectors.