The Bambino's hat was famously worn by Bombers hurler David "Boomer" Wells in the June 18, 1997 game. A devoted fan, Wells wore the hat to honor Ruth by bringing the cap back to Yankee Stadium and wearing it on the mound.
The size 7 & 3/8 navy blue flannel is in amazing condition, featuring the symbolic wear-and-tear accumulated over Ruth's use. Modern caps are a darker blue, even virtually black, and in Wells' playing days, were made of wool.
The auction house opened bidding, and the online sale is up until May 19. Other notable items in the baseball sale include: a 1920 Yankees jersey worn by Ruth expected to auction for more than $1 million, the cap worn by Bobby Thompson when he slugged the "Shot Heard 'Round the World" for the New York Giants in 1951 that could go for $100,000, Mickey Mantle's 1958 road Yankees Jersey that's expected to reach $100,000 and the baseball card collection of former All-Star Dmitri Young, including more than 491 cards sold in individual lots.