The market value of a Nolan Ryan baseball card may range from less than $1 up to $15,000. The value of the particular card is ultimately dependent on its year of issue, manufacturer, condition, whether it has been professionally graded and other factors.
The most valuable Nolan Ryan card is his 1968 Topps Rookie card, which features the Hall-of-Famer and fellow Mets pitching prospect Jerry Koosman. As of 2015, a certified, mint-condition copy of the card is worth up to $15,000, according to Professional Sports Authenticator, the largest grader and authenticator of collectibles in the world. More recent Ryan issues from the early 90s, toward the end of his career, are very easy to find and readily available on various auction sites for under $1.