LeBron James' 2013 Finals Game 7 Jersey Sells For $3.7 Million

LeBron James is the king on the court and now on the auction block too -- the NBA superstar's used jersey from Game 7 of the 2013 NBA Finals just sold for $3.7 million ... a new record!!

Sotheby's announced the final price tag for the incredible piece of memorabilia Friday morning -- making it the highest-selling game-worn James jersey to date.

This specific #6 jersey is the exact threads James wore when the Miami Heat beat the San Antonio Spurs, 98-88 ... securing LeBron's second championship.

It was a historical night for James ... as it was the first Game 7 of his NBA career, and he secured his second NBA Finals MVP award in the process.

The jersey sold for $3,680,000 at the auction ... which makes it the third most valuable game-worn jersey ever sold at Sotheby's, and among "the highest prices achieved for any game-worn jersey on the open market."

Sotheby's tells TMZ Sports it was purchased by a private collector.

"Today's tremendous result comes at a pivotal time in LeBron James' career, where he is in arm's reach of clenching the all-time points record -- one of the NBA's most revered accolades," Sotheby's officials said on Friday.