13.25x18" flat from 1967. The front panel features bowl of cereal w/inset box showing Bozo the Clown and reading "Get A 3-D Cartoon Viewer" and back has full panel offer showing boy using "Kenner's See-A-Show Stereo Viewer Set." Box at bottom features images of featured characters which include Barney Google and Snuffy Smith, Bozo and Captain America as well as "10 Surprise Shows." Flat is folded along center scored line and shows some handling wear at top center, o/w an unused file copy. VF/Exc. Box features a rare Marvel Comics character appearance on a 1960s product box.