Colin Kaepernick's jersey from his NFL debut with the 49ers just sold for a whopping $128k ... the highest price an NFL jersey has EVER fetched at auction.

The jersey is from Kap's rookie debut on October 2, 2011 -- when he came in for Alex Smithfor one snap against the Philadelphia Eagles ... which is why the jersey is so clean!

Kap handed the ball off to Frank Gore -- and then went back to the bench. The 49ers won the game 24 to 23.

Of course, Kap's career took off the following season -- he started 7 games and then became the full-time starter in 2013. The rest is history.

Kaepernick signed the jersey from his rookie debut -- inscribing it with the message "2011 game worn rookie jersey" -- and then gifted it to family friend and reporter, Aaron Prince, who put it up for auction in 2019.

The item made its way to Julian's Auctions in 2020 -- where it sold at a high profile event for $128,000 to a buyer whose identity has not yet been revealed.

Julian's claims it's the highest price ANYONE has ever paid for a game-used NFL jersey, EVER.

As we've previously reported, Kap memorabilia has been HOT in with collectors over the past few years ... a combination of interest in Kap as an athlete AND as a social justice icon.

There were more cool items at the auction -- including the NBA jersey given to Michael Jordan on the day he signed with the Bulls in 1984 ... that went for $320,000.

And, a high school basketball jersey worn by Barack Obama in 1979 at Punahou School in Hawaii sold for $192k!

By the way, Obama's jersey number -- 23!

This story originally appeared on: TMZ - Author:TMZ Staff