A man is suing the New England Patriots Hall of Fame ... claiming it ruined his one-of-a-kind, Tom Brady signed American flag -- costing him potentially over $1 MILLION.
The guy's name is Daniel Vitale ... and he says in a new lawsuit, obtained by TMZ Sports, that back in early 2020, he acquired a flag that had been autographed by the GOAT.
In his lawsuit, Vitale says the flag was ultra-rare. It had flown at Foxboro Stadium during a Patriots vs. Dolphins game in 2001 -- the same season that Brady first took over as the starter in New England -- and was signed by the quarterback a few years later.