Topps experimented with a variety of baseball card alternatives and innovations in the '60s and '70s, some of which are very valuable today.

Vintage checklist cards were once ignored and written on, but today PSA 9 and PSA 10 examples can sell for five figures.

From 1955 to 1973, every Topps set featured Willie Mays, Hank Aaron, and Roberto Clemente. What's more, nearly all of those sets included Mickey Mantle, Ernie Banks, and Frank Robinson, to say nothing ...

Collectors have seen the list of the 75 most iconic Topps baseball cards of all-time, but what about the cards that didn't make the list? Beyond 75: The Five Most Iconic Topps Cards Not to Make the Li ...