Vito B are beautiful, small but heavy cameras.
Well made, sturdy, they have excellent lenses, some with a fast 2.8 f/stop aperture.
The loading film system is very easy, by a large opening back.
Vitomatic series have the same opening system.
The shutter doesn't fire without film in the camera.
The different models development concerns shutter improvement and
small finder replaced by a large bright line finder.
Vito B cameras do not have light meter nor rangefinder.
Vito BL cameras have an uncoupled light meter.
Vito BR cameras have a coupled rangefinder.