The Fisher-Price Movie Viewer was introduced in 1973 as the Movie Viewer & Cartridge. The Movie Viewer was very popular both because it does not require batteries, bulbs, nor any other replacement requirements and because Fisher-Price manufactured several popular movie cartridges that appeal to children.
I remember having two or three of these from garage sales. I loved them and they were so easy to operate. No batteries needed, just slide in the cartridge and turn the crank.