Baseball cards have long been a popular collectible, especially for those looking to stumble upon a valuable find from years past. With the hobby booming once again, here are 21 baseball cards that could be worth a small fortune if found in your attic or stored away in a shoebox.

1909 T206 Honus Wagner – This is considered the holy grail of baseball cards, with only around 60 known copies in existence. The rarity and historical significance of one of baseball’s earliest superstars makes this the most valuable card on the market. In recent years, PSA-graded examples in Gem Mint condition have sold for over $3 million at auction.

1952 Topps Mickey Mantle – As one of the most iconic players of all time, Mantle’s rookie card is hugely sought after by collectors. High-grade copies have reached $2 million+. The 1952 Topps set is also notable for being the first widely distributed set after WWII.

1933 Goudey Babe Ruth – One of the earliest mass-produced cards featuring Bambino in action, these have become extremely scarce over the decades. PSA 10 specimens have topped $500,000. Any high-quality Ruth from this set holds tremendous value.

1948 Leaf Jackie Robinson – Robinson’s first card captured history as the man who broke baseball’s color barrier. Pristine PSA 10 examples now sell for over $350,000 due to their significance. Other high-grade ’48 Leaf Robinsons can still fetch five figures.

1948 Bowman Ted Williams – Considered the best pure hitter ever, Williams’ sole 1948 issue is a key post-war vintage card. PSA 10s have reached $230,000 at auction.

1951 Bowman Mickey Mantle – Mantle’s rookie season was 1951, making this his first card issued. PSA 10s of this classic design have sold for $200,000+.

1957 Topps Hank Aaron – Before breaking Babe Ruth’s home run record, Aaron was already one of baseball’s brightest young stars. PSA 10 examples of his ’57 Topps rookie have sold for $110,000.

1913 T206 Walter Johnson – One of the hardest throwers in history, “The Big Train’s” card is highly coveted. High-grade T206 Johnsons can sell for upwards of $100,000.

1914 Cracker Jack Joe Jackson – “Shoeless Joe” Jackson’s career was tainted by the Black Sox Scandal, making his scarce pre-scandal cards very collectible. PSA 10 specimens have reached $90,000.

1975 Topps Nolan Ryan – Ryan’s record-setting career is commemorated in this iconic action shot from his early days with the Angels. PSA 10s have sold for $85,000.

1967 Topps Tom Seaver – Seaver’s first Topps issue captured the pitching phenomenon at the start of his career with the Mets. PSA 10s have reached $80,000.

1969 Topps Willie Mays – One of the best all-around players ever, Mays’ 1969 card shows him in action for the Mets. PSA 10s have sold for $70,000.

1948 Leaf Minnie Miñoso – Miñoso was a trailblazer as one of baseball’s first black Latino stars. His scarce 1948 Leaf rookie in high grade is worth $60,000.

1987 Fleer Griffey Jr. – Griffey Jr.’s rookie season was 1987, making this his first card. PSA 10s have sold for $50,000 due to his iconic status.

1909 T206 Mathewson – Like Wagner, “Matty” was a superstar pitcher of the early 20th century. High-grade T206 Mathewsons can reach $45,000.

1989 Upper Deck Ken Griffey Jr. – Considered one of the most iconic modern rookie cards, PSA 10 copies have sold for $40,000.

1969 Topps Reggie Jackson – Before being called “Mr. October,” Jackson was already a rising star on this coveted early issue. PSA 10s sell for $35,000.

1972 Topps Johnny Bench – As arguably the greatest catcher ever, Bench’s defense is immortalized on this classic card. PSA 10s have reached $30,000.

1954 Topps Sandy Koufax – Koufax’s rookie season was 1955, but this 1954 issue established him as a rising prospect. PSA 10s sell for $25,000.

1958 Topps Hank Aaron – Aaron’s breakthrough season of 1957 made this 1958 issue very desirable for collectors. PSA 10s have sold for $20,000.

1933 Goudey Dizzy Dean – One of the most colorful personalities in baseball history, Dean’s charisma lives on through his early 1930s cards. PSA 10 examples sell for $15,000.

1917 M101-4 Eddie Plank – High-grade specimens of this scarce Plank card from a pioneer tobacco era set can reach $10,000.

As you can see, finding high-quality vintage cards of all-time great players and historically significant rookies offers a chance to uncover hidden baseball memorabilia treasure. With values constantly changing based on the current auction market, it’s always worth having valuable old cards appraised by experts.