This is getting into more detail than I had planned, but here goes. The camera is a Bell and Howell Electric Eye 127. It uses a photocell to control an infinitely variable f/stop. There's no way to control it manually. There is one shutter speed. I suspect the switch is changing the light sensitivity of the photocell and, thus, the range of f/stops - one range for slower film, another range for faster films. There are no markings to show f/stops nor any indication of what the shutter speed is, so I'm not aware of any way to do computations.
The reason for my question is this - 100-speed film is still available, so if the Super Anscochrome setting was for 100ASA film, I can possibly still use the camera. I'll buy a roll of the modern film and see what happens.
Thanks for your help.