A grey Nintendo World Championships Cart, whose owner was located in Bellevue, Washington, was succesfully sold over Ebay for $ 20,200. The item received 67 bids.
This is one of the more common cartridges from the actual Nintendo World Championships, held in 1990 in Universal Studios Hollywood. The carts have copies of Super Mario Bros, Rad Racer, and Tetris, and players had to play through these games with a time limit of 6 minutes and 21 seconds. 90 of these carts were given out to the fans and competitors who attended the event and are known to survive.
Of course, Ebay will remove the listing in a few hours, so for the sake of posterity we’ve screencapped it for you here: