A limited series of 15 unique most valuable 1990 pro set football cards. Love them or hate them, 1990 Pro Set football cards will always be known for the incredible amount of errors and variations scattered throughout the set.

To achieve its vision of being a "living set," the company was constantly updating, revising, removing, and replacing various cards.

While ambitious in spirt, that body of work ultimately resulted in one of the most notoriously variation-laden sets in hobby history.