Babe Ruth's Jersey

Kohler describes Babe Ruth as "the king of sports memorabilia." The record-breaking sale of this game-worn 1920 Yankees road jersey cemented that status. The jersey is the earliest-known Ruth uniform in existence, a fact that – given its excellent condition and the scarcity of game-worn Ruth apparel – made it extremely attractive to the most competitive baseball collectors. The shirt went for $4.4 million in 2012, becoming the most expensive piece of sports memorabilia ever sold.

What could possibly eclipse its price in the future? "Some people have often wondered if a jersey exists from his years playing with the Red Sox," Imler says. "Certainly something that would have potential would be his rookie jersey from 1915."