A Mickey Mantle baseball card just sold for $5.2 MILLION at auction ... smashing the previous record by over a million bucks!!
The 5 million dollar card?? A 1952 #311 Topps Mickey Mantle ... considered one of the most desirable trading cards in existence.
We're told the card -- graded in mint condition and 1 of only a few in existence -- was brokered by the people at the online auction site, PWCC.
Aside from Mickey being a 20x All-Star and 7x World Series champ .