Oakland Athletics: First Mascot - Charlie O the Mule

Remembering Charlie-O the mule, the A's mascot inspired by Charles O. Finley - The Athletic

Before Oakland, vagabond A's franchise led colorful past lives in Philadelphia, Kansas City - ESPN

Oakland Athletics: First Mascot - Charlie O the Mule

Vintage Oakland A's Athletics Charlie O. Button. Charlie Finley's Mule. Mascot

Monday Mascots #3: Charlie O The Mule

Who (what?) is Stomper, the Las Vegas A's mascot?

Mustaches and Mayhem: Charlie O's Three-Time Champions: The Oakland Athletics: 1972-74 (SABR Digital Library): Greene, Chip, Greene, Chip, Erion, Greg, Levin, Len, Nowlin, Bill, Wolf, Gregory H., Wancho, Joe, Armour, Mark, Costello

How the A's elephant is rooted in an age-old rivalry, and why it has endured for over a century - The Athletic

CHARLIE 'O THE MULE® – Oakland Athletics History

Rare Lot 2 - Charlie’O Mascot Oakland A's Athletics Kansas City 3-1/2” Decal/Sticker 1- Charlie’O Mascot Oakland A's Athletics Kansas City

Rare Lot 2 - Charlie O. Mascot Oakland A's Athletics Kansas City 3-1/2” Decals

When Oakland A's owner Charlie Finley pulled out all the stops for Opening Day

Charlie-O — Baseball's Favorite Mule, by Michael Murphy, SMC Sports Journalism