One of the most valuable 1989 baseball cards that is frequently worth over $1000 is the Ken Griffey Jr. rookie card. Griffey was one of the most exciting young players to enter the league in 1989 and his rookie card was in high demand. While the Griffey rookie was very common in packs and sets in 1989, it has aged very well due to his legendary career. In near mint condition, the Griffey rookie routinely sells for $1000-2000. High graded versions with a PSA 9 or 10 rating can be worth over $10,000.

Another major star whose 1989 rookie card also holds great value is Greg Maddux. Maddux went on to have an illustrious career winning over 350 games and is considered one of the best pitchers ever. His rookie card was found in packs and sets like Bowman, Fleer, and Donruss. Ungraded near mint copies are valued around $200-400 but graded versions start increasing substantially from there. A PSA 10 Maddux rookie has recently sold for over $6000 showing there is strong collector demand for one of the cleanest Maddux rookies in existence.

A player whose career ended up being cut short but whose rookie card remains highly coveted is Jeffery Leonard. Leonard had some excellent seasons with the San Francisco Giants where he won the 1987 World Series MVP. Injuries derailed his career after a few years. His 1989 Upper Deck rookie card stands out as one of the most visually striking and memorable from the set. Given his popularity at the time and short career, ungraded copies hover around $300-500. Higher graded versions can reach $1000-1500 levels due to the limited number still in pristine condition after 30 years.

Roberto Alomar had a Hall of Fame worthy career yet one of his earliest and most iconic cards is his rookie from 1989 Bowman. Alomar was already an established star by 1989 after winning a gold glove in 1988 but this served as his true rookie card release. The aesthetics and photo on this card made it very popular upon release as well as throughout the intervening decades. Near mint Alomar rookies today sell between $150-350 with the best condition specimens grading PSA 10’s pushing $2000-3000.

Sandy Koufax is regarded as one of the top left handed pitchers in MLB history but he had been retired for over 20 years by 1989. Still, collectors had a strong demand for any new Koufax cards entering the market during the baseball card boom of the late 1980s. His 1989 Upper Deck card took advantage of this collecting fervor by using a unique pose from his playing days. This helped the Koufax in this set remain quite valuable since the late 80s. Ungraded copies tend to be $75-150 while high grade options above PSA 8 can exceed $400-500.

Rocket Roger Clemens was already a two time Cy Young award winner by 1989 but collectors were eager to add any newer Clemens issues to their collections during the junk wax era. His redemptive performances later in his career have also aided the value of his 1980s offerings such as the one found in 1989 Upper Deck. Near mint Clemens from this set command $50-100 today. Those that have achieved the ultra high grades of PSA 9 or 10 can be worth $300-500.

The late 1980s also brought some very desirable rookie cards for players who went on to have Hall of Fame careers such as Barry Larkin. His first baseball card was in the 1989 Topps set and collectors have long recognized it as one of the better looking and most identifiable rookie issues of all time. Ungraded near mint copies can be found for $75-150 range. Graded 9’s and 10’s have been selling for $500-1000 showing the card still retains strong collectible demand.

While many star players like those above had the benefit of already established careers in 1989, the era was also producing some future superstars who were getting their first cardboard. One of the best examples is the Ken Griffey Jr rookie from Upper Deck which has a picture of a young Junior smiling in his Seattle Mariners uniform. This iconic rookie card helped cement Griffey as a fan favorite for life and the cards have maintained high values ever since. Near mint copies trade hands for $400-800 commonly. The very best preserved earning a PSA 10 grade have changed hands for astronomical prices upwards of $50,000.

In conclusion, 1989 produced trading cards for many legends who were still in the early stages of their careers as well as rookies who went on to greatness. 30 years later, key rookie and star issues from sets during that season like Upper Deck, Bowman, and Topps remain quite valuable in high grades. With the vintage baseball card market at an all-time high, desirable 1989’s like the Griffey and Maddux rookies regularly sell for thousands to serious collectors and investors. This era produced iconic cardboard that any collection aiming to span MLB history needs representations of.