Barry Bonds historic 500th home run ball -- launched into McCovey Cove during the 2001 MLB season -- is on the auction block ... and is expected to bring in around a quarter million bucks!
Of course, the 500 Home Run club is one of the most prestigious groups in all of Major League Baseball ... consisting of just 28 legendary sluggers like Babe Ruth, Willie Mays, Hank Aaron and the home run king himself, Bonds.
The ball Barry crushed off Dodgers pitcher Terry Adams on April 17, 2001 is now available for bidding at SCP Auctions (the same people who sold Ruth's 500th home run bat for $1 million!