This is a panorama viewer purchased at the 1970 Osaka Expo. The images from the fifth photo onwards were taken through the right-side viewing window, but they appear even more beautifully three-dimensionally when viewed with both eyes. It has a retro feel. It uses a cassette tape mechanism and is operated manually. Sometimes it turns smoothly, and sometimes it's heavy. Reversing the tape (film) can improve it slightly. You might also try opening the case. It's old, so it's not perfect, but please understand. There is no box or instruction manual. I am also selling other Expo '70 goods. Panorama Stereo Viewer panorama_stereo_viewer Gakken, Rare Item Tower of the Sun