The 2011 "Platinum" Mike Trout Topps Update card is one of the most coveted modern-day baseball cards in existence.

We're told that DJ Skee -- who's worked with top artists like Kendrick Lamar and Post Malone -- along with Mint 10 business partners Courtney and Carter Reum (Paris Hilton's fiancé) ... dropped nearly $1.1 milli on the cardboard.

Collectible marketplace, PWCC brokered the sale, according to the company.

The front of the card features a photo of a then 19-year-old Trout at the plate in his Angels uni. The back is stamped 1/1 ... and says "The New Jersey born speedster debuted on July 8 vs. Seattle, then showed his wares the next night with his first hit and two runs."

The card -- rated a Mint 9 by the card graders at Beckett -- will be on display this week at the Topps booth at the National Sports Card Convention in Chicago.

And, if you don't have 7 figures to spend on a card, Skee teamed up with Topps ... and is releasing a wayyyy more affordable, $20 card that resembles the ultra-rare Platinum card.

Of course, the high-end card market has EXPLODED over the last few years ... a 2009 Bowman Chrome Superfractor sold for $3.9 million in August 2020.