A gold-and-purple Lakers warm-up jacket that Quinn Brown pulled from a Goodwill Outlet bin in Hillsboro for $3.07 has been authenticated as game-worn by Wilt Chamberlain during the 1972 NBA Finals.

Sotheby's estimates it will sell for $150,000 to $250,000.

Brown, a 19-year-old Portland resident, spotted the jacket in January while another shopper was holding it. When that person put it down, Brown grabbed it.

"He just threw it in front of me, and I immediately grabbed it," Brown told KPTV.

The instinct paid off. After posting a photo on Instagram, Brown caught the attention of Sotheby's, which shipped the jacket to New York for professional authentication. SIA Photo Match confirmed it: the jacket matched images of Chamberlain wearing it during the 1972 NBA Finals and throughout the 1972-73 season, his final year in the league.

Chamberlain won Finals MVP in that 1972 series, averaging 19.4 points and 23.2 rebounds as the Lakers beat the New York Knicks in five games. That Lakers squad won a then-record 69 regular-season games, including 33 straight.

The jacket is listed in Sotheby's Summer Sports Classic auction. Bidding opened Tuesday, July 1, and runs through Sunday, July 20.

Brown is no stranger to the bins. He started reselling thrifted items as a high school junior and turned it into a full-time career, logging more than 10,000 sales over roughly three years. He spends 15 to 20 hours a week digging through Goodwill Outlet bins searching for hidden value.

Brown told KPTV he's a Lakers fan who keeps a Wilt Chamberlain book on his dresser and a Chamberlain card given to him by a friend. He said he plans to save the auction proceeds, hoping the windfall helps him retire early.

For context on what Chamberlain memorabilia commands: the NBA Finals jersey he wore under that same warm-up jacket sold at a prior auction for $4.9 million.

Hayley Platt, public relations manager for Goodwill Industries, called Brown's discovery "the perfect example of how hunting for treasures at Goodwill is thrilling."

The Sotheby's auction closes Sunday, July 20.