Tim Brown's 1987 Heisman Trophy has just been auctioned off ... and the winning bid was $435,000 ... TMZ Sports has learned,
Brown won the trophy during his legendary senior year at Notre Dame -- when he caught 137 passes for 2,493 yards and 22 touchdowns.
The NFL Hall of Famer had sold the trophy in a private sale in 2017 -- and the person who bought it consigned it to Goldin Auctions in New Jersey to be auctioned off.
The identity of the new owner has not been disclosed.