Barry Bonds crushed Ubaldo Jimenez’s 99 mph fastball over the left-field fence at Coors Field on Sept. 5, 2007. No one knew it at the time, but it was the Giants’ left fielder’s final home run.

Twelve years later, the No. 762 home run ball will go up for auction by Goldin Auctions at 9 a.m. Friday.

In April 2008, the ball sold for $376,612. Friday’s opening bid will be $150,000. Opening bids generally start relatively low to engage bidders.

Alex Rodriguez’s 500th homer bat and ball, Mark McGwire’s 500th homer ball and Bonds’ 754th homer ball (the one hit before he tied Henry Aaron for the all-time majors record) also will be in the 1,200-lot auction that runs through May 11 at GoldinAuctions.com.

The day Bonds hit his 762nd homer, he wasn’t the headliner. In fact, Major League Baseball didn’t bother to authenticate it. The bigger story was catcher Bengie Molina, who hit his 100th career homer.

Molina wanted the ball for a keepsake, so it was retrieved by Coors Field security, and a deal was struck with a fan for Molina to get the ball. MLB’s on-site authenticator, Mark Lewis, marked it with a hologram sticker.

There was no attempt to track down the Bonds homer ball. It was early September, and the expectation was he’d keep padding his record. MLB had planned to return to authenticating balls thrown to Bonds the following homestand.

MLB temporarily had stopped putting marked balls in play for every Bonds at-bat, so he hit an unmarked ball for his final homer. That day, The Chronicle asked Lewis about MLB’s decision not to authenticate the ball even though 762 could have gone down as the record.

“It’s a risk,” Lewis said.

A half-year later, a man from Boulder, Colo., named Jameson Sutton appeared at a news conference to present a ball he said was Bonds’ 762nd. At the time, SCP Auctions said it authenticated the ball through video and interviews of fans and gave Sutton a polygraph test, which SCP said he passed.

Shortly thereafter, when it still was uncertain if Bonds’ career was over — he was facing perjury and obstruction charges stemming from a BALCO investigation — Sutton’s ball sold for $376,612 to an unnamed bidder.

Now it will be resold by Goldin Auctions, which stated in a news release it “comes with impeccable provenance including three affidavits and video of Sutton catching the historic homer.” A quick Google search of the homer shows a fan reaching over the wall, the ball popping from his glove and a scramble ensuing.

SCP also sold the ball Bonds hit for his 756th homer, which broke Aaron’s record. That went for $752,467 to Marc Ecko, who stuck an asterisk on it and gave it to the Hall of Fame.

The Giants had 22 games left after Bonds’ homer in Colorado, but he sprained his right big toe and played just eight more games. He had five more hits, all singles.

Seventeen days after No. 762, managing general partner Peter Magowan announced Bonds wouldn’t return in 2008, and Bonds played one more game, the home finale.

Bonds became a free agent after the season, and no team signed him despite his 28 homers and league-leading .480 on-base percentage.

John Shea is The San Francisco Chronicle’s national baseball writer. Email: jshea@sfchronicle.com Twitter: @JohnSheaHey