I just bought a Mamiya twin len camera w/ three lens and wanted to test each one. Opened the back and there was a roll of film still in the camera. The tape was broken but was still rolled. Like opinions as to what I can do. Dont know if it is exposed or not exposed. Cant tell.
120/220 cameras do not rewind AFAIK. Normally the film travels one way, so it should be obvious unless somebody moved the exposed film to the opposite position.