Who remembers View-Masters? I do!
Mum used to look for the rack of View-Master slide sets wherever we travelled. These were 'educational' - that was always her preferred kind of souvenir. Some were cartoons though, and I do have one of 'Knights in Armour'!
I have a box full here. In fact, not long ago I bought a newer viewer. But, I still have the old one here. And, I'll still buy sets showing British Columbia scenes, if I don't have them already.