What would make a baseball hat worth $300,000?

Answer: it was worn by Babe Ruth.

And it wasn’t just any hat. The Great Bambino wore it during his 1934 tour of Japan.

CNN reports the navy blue hat emblazoned with a "US" logo is believed to be the only hat the legendary slugger wore during the month-long tour, except when he swapped the cap for a little leaguer's hat, resulting in the classic photo of the Sultan of Swat with a tiny hat perched on his head.

The hat sold for $303,277 on the site Grey Flannel Auction.

Read more from CNN.