Wisconsin stash yields 97 pristine Super Mario Bros./Duck Hunt NES cartridges

Two Wisconsin collectors uncovered 97 uncirculated 1993 NES cartridges of 'Super Mario Bros./Duck Hunt,' a rare variant believed to be the last production run; five copies earned PSA perfect 10, an unprecedented score for NES carts, and three perfect-10 carts will be auctioned online while the duo keeps one 10 and several high-9s. The find could attract six- to seven-figure sums, though exact value is unclear, and a charity auction may follow after the initial sale.