Mickey Mantle's last Yankees jersey just netted a small fortune at auction ... raking in a staggering $2.2 MILLION!!!
Officials at Heritage Auctions tell TMZ Sports ... the sale just closed over the weekend, and it was an historic one, because it's now the highest price ever paid for a Mick jersey.
In fact, the price tag was so high, it was hundreds of thousands of dollars more than what experts initially thought it could fetch.
As for why it sold for so much ... well, the 1968 NYY gear is that historic. It not only was the last jersey Mantle wore in his final baseball season -- it was also autographed, and featured a personalized message from the Yankees legend.
The previous record for the Mick jersey was $1.3 million in August 2018.
It's not the only piece that outshined its expectation at Heritage Auctions last month -- a basketball signed by Barack Obama, Kobe Bryant, LeBron James, Magic Johnson and Carmelo Anthony sold for $99K, which is eight times more than the pre-auction estimate of $12,000!