American Tobacco Company's 1909 T206 Honus Wagner, the 1955 Topps Roberto Clemente and the 1954 Topps Hank Aaron are some of the most valuable baseball cards, as of 2015. The ATC T206 Honus Wagner is often considered the most valuable card, selling in a 2007 auction for $2.8 million.
The highest-value baseball cards are typically vintage cards with low production numbers, and the condition is extremely important. The 1955 Topps Roberto Clemente with a perfect 10 PSA rating sold at auction for $432,690, while the same card with an 8 PSA rating is valued at $6,000. Rookie cards also typically sell for more, such as the 1954 Hank Aaron, which sold for $357,594.