The year 1990 produced several rookie cards and rookie seasons that have gone on to become very valuable in the decades since. Some of the most notable rookie cards from 1990 that have increased substantially in value include:

Ken Griffey Jr. (Upper Deck): Griffey’s legendary career and popularity has made his 1990 Upper Deck rookie one of the most iconic and valuable cards ever. Fresh off being the No. 1 pick in the 1987 draft, Griffey broke into the majors in 1990 with the Seattle Mariners and showed early signs of greatness. While its value has fluctuated over the years, Griffey’s rookie routinely fetches thousands of dollars now in top grades. In mint condition, a PSA 10 of this card has sold for over $25,000.

Frank Thomas (Fleer): Thomas announced his presence with a roar in 1991 when he won the AL MVP and Rookie of the Year awards. But it started with his rookie season in 1990 where he showed excellent plate discipline and opposite field power. The Fleer rookie card has been a steady riser, with PSA 10s going for over $5,000 due to Thomas’ Hall of Fame career and status as one of the game’s greatest hitters.

Chipper Jones (Bowman): The No. 1 pick in the 1990 draft, Jones didn’t debut until 1991 but made a huge impact immediately. He became a perennial All-Star and would win the NL MVP in 1999 while playing his entire career for the Atlanta Braves. His ornate 1990 Bowman rookie with his boyish smile increased in demand. Top conditioned copies now sell for over $3,000.

Todd Helton (Score): While Helton didn’t have the star power of the first three players on this list, he did have an outstanding 17-year career largely with the Colorado Rockies. A career .316 hitter, Helton brought consistency at the plate. His 1990 Score rookie has achieved Icon status among Colorado fans and collectors. Near mint copies can go for $700-900 while a PSA 10 would eclipse $2,000.

Sammy Sosa (1990 Score): Sosa’s career took off later in the 1990s, but this was his true rookie card issued after a September cup of coffee in 1989. The Dominican outfielder showed early power promise. While not in the same class as others, Sosa’s iconic home run chase years increased demand for this rookie card. PSA 10s now sell in the $300-400 range.

Jeff Bagwell (Minor League): Bagwell was drafted by Boston in 1989 but didn’t debut until 1991 after being traded to the Houston Astros organization. Still, collectors at the time were curious about the highly-touted first baseman/third baseman coming up through the minors. His scarce 1990 Minor League Houston Astros Gulf Coast League issue has grown in demand from Astros collectors. A PSA 10 would be worth $1,500-2000.

Mike Piazza (Minor League – Dodgers): Like Bagwell, Piazza’s power-hitting future hadn’t materialized yet in the Dodgers system in 1990. But collectors were enthusiastic about the slugging catcher’s potential future and snatched up his minor league issues while they were inexpensive. Now they’ve proven very wise investments. A PSA 10 of his 1990 Dodgers Salinas Stockton Spurs RC fetches over $2,000.

Don Mattingly (1990 Topps Traded): By 1990, the “Donnie Baseball” hype had faded slightly as Mattingly hit a career-low .302 in 1989 while battling back injuries. Still beloved in New York, Mattingly was perhaps underestimated going into 1990. He bounced back with a Gold Glove and his 6th All-Star appearance. The Traded issue honors that and has grown popular with Yankees fans in recent times. Near mint copies sell for $150-200.

Juan Gonzalez (1990 Score/Fleer): “Juan Gone” became a two-time AL MVP but it started with his debut in 1989 with tremendous power promise. The aggressive young Dominican outfielder was quite popular even in his early years. His 1990 Score and Fleer rookies have increased in demand from Rangers fans and collectors. A PSA 10 Score RC now sells for $250 while a Fleer PSA 10 exceeds $500.

Besides star rookies, talented veterans and franchise players performing well in 1990 provided opportunities for affordable investments at the time which have paid dividends now. For example:

Nolan Ryan (1990 Topps/Traded): At age 43 in 1990, most thought the “Ryan Express” was finally slowing down after pitching for the Texas Rangers. But he turned in one of his finest seasons ever, making his 7th and final All-Star team while leading the league again in strikeouts. Cards from his milestone season command over $30-50 now.

Cal Ripken (1990 Topps/Stadium Club): In the prime of his epic consecutive games played streak, Ripken was one of baseball’s most popular players. His 1990 Topps update issue honors his back-to-back AL MVP awards. High grade versions sell for over $100 due to his enduring legacy.

Dave Winfield (1990 Topps): The durable, power-hitting veteran was still a productive all-around force for the California Angels in 1990. As a 12-time All-Star nearing the end of a Hall of Fame career, Winfield cards gained nostalgia value over time. His commons can be acquired for $10-15.

In summary, 1990 produced rookies like Griffey, Thomas, Jones, and Bagwell who went on to great careers – skyrocketing the value of their rookie cards decades later. Stars maintaining excellence like Ripken, Ryan, and Winfield created affordable investments at the time. While 1991 may be hailed as a greater rookie class, savvy collectors realized potential in 1990 and are being rewarded for it today in the vintage market. Of course, always carefully grade your cards to maximizeROI.