There were several different versions of the Vito Automatic made between 1960 – 1968. Mine is one of the earliest. It was aimed squarely at the point-and-shoot market, with very few settings for the user to control apart from dialling in the film speed and setting the focus distance. It has a selenium meter built in which shows a little green dot in the viewfinder if lighting is sufficient. Half red/half green means on the edge and red means not enough light.
A user sets the film speed before loading the camera and then each shot is taken at a fixed shutter speed per ASA(ISO) rating. ASA200 is the fastest it will cope with, when the shutter is set to 1/500s and the aperture is set by the camera in accordance with the light in the scene. The user has no way of changing this.
If you want to do flash shots, the camera has to be taken off Auto mode and the shutter is then set to 1/30s. Only then does the user have some control over the aperture on the ring outside the lens. See my photos made with the Vito Automatic.