I was always curious how these worked. I just assumed they were like those viewmaster things that had a lever that switxhed between still images, except with a crank. So it was actually film and the "movie" would play as fast as you turned the crank? Pretty cool.
I've never once heard of the Movie Viewer but I have heard of Mattel's View Master. I have also heard of both Sesame Street and Pink Panther and man are those just some super duper awesome classic kid shows for sure!! For those who haven't seen either I would highly suggest them both because man are they just 1 trillion times better than today's Bluey, Cocomelon, Paw Patrol, and Puppy Pals all combined!