Wallet Card in Depth: 1990 Leaf Sammy Sosa
In the summer of 1990, a seemingly ordinary baseball card emerged that would forever alter the collecting landscape, yet few understood its true significance at the time. Beneath its pristine white borders lay a concept that would shape the way checklists are constructed to this day. What made this card so different, and why did it become the catalyst that changed everything about modern baseball card collecting?