A key piece of memorabilia from the Denver Broncos’ most renowned fan is up for bid on eBay.

An authentic, game-worn barrel, sported by Tim McKernan during the 2000-01 season, is listed for $300, with a “buy it now” price of $500.

The barrel comes with a signed letter of authenticity from widow Becky McKernan, according to eBay.

McKernan, known to all Broncos fans as “The Barrel Man,” attended home games, no matter the weather, for over 30 years wearing only a barrel, a cowboy hat and boots.

McKernan was among the first class inducted into the VISA Hall of Fans at the Pro Football Hall of Fame in 1999.

McKernan died in December 2009 at age 69.

Ryan Parker: 303-954-2409, rparker@denverpost.com or twitter.com/ryanparkerdp