Stan Musial – 1948 Bowman
The oldest card that is still somewhat reasonably priced would be Stan Musial’s 1848 Bowman card. The St. Louis Cardinals icon was immortalized by the set. It’s neither likely nor impossible to find one in your own attic, though it wouldn’t hurt to look since selling one in good condition can earn you more than $1,000.
Babe Ruth – 1914 Baltimore News
In 2012, despite only being graded 2, a copy of the 1914 Babe Ruth card racked up $575,000 in value. The reason it’s expensive is that rumor has it there are only 10 existing copies of such a card.