I think it’s the Super Cup er….cup.
We got a plaque for being the bosses of all Europe, described by my late pal on the night, “Look, Willie Miller’s got a hud o’ Gunther Netzer’s P45”. When Manchester United won the Super Cup, they were given an actual cup, and for some reason ended up with two such trophies, the club, or the AFC Heritage Trust (my memory is hazy) bought the spare from the inferior club that Fergie left us for in November 1986.
https://www.afcheritage.org/articles...&type=trophies
The Trust is doing terrific work in archiving the Dons’ history, but its efforts are voluntary and it has operating costs. If you do visit, please consider clicking on the “donate” button and give a quid or two to a most deserving cause.