This is a 8mm movie camera made in Japan about 1956. That was about the date that home movies peaked. Like all 8mm cameras of that period, this camera was loaded with “double 8” film. This is actually 16mm wide movie film with sprocket holes on both sides. This film came wound a metal spool. You loaded the film spool in subdued light. You then began taking movies. The roll contained about 25 feet of film, enough for about 3 minutes of filming. After the roll was exposed, you removed the roll from the camera, turned it over, and re-loaded the same roll back into the camera. After the reload, you continued filming for about another 3 minutes. The exposed film was then sent out for developing.
At the developing shop (photofinishing shop), the film was developed by bathing it in a series of chemical baths. The now developed film was then slit down the middle and the two ends spliced together making a roll of developed movie film 50 feet long. When the film returned from the photofinisher, you got out your handy dandy 8mm film projector and screen. That evening you held an at home move show inviting your friends in to see a 6 minute home movie.
I advise that you put this camera on a display shelf so you and others can admire it. Some may reminisce the good old days of home movies (not me).
P.S. This camera was made before zoom lens became abundant. This camera featured a revolving lens turret holding three lenses. A telephoto, a “normal” and a wide-angle, could be manually rotated into place. Also, no electric motor to drive the film, on the side is a key wind, you turned it to wind the spring motor that moved the film during filming.