On most of my manual cameras with a shutter speed dial on the top plate the shutter speed faces the prism. I'm looking at a Nikkormat EL that is configured that way. On my F2 there is a very small black line against the prism but the larger gray line about 45 degrees between that and the back of the camera. I feel silly for asking this but which line indicates the shutter speed? Most all on line info is dedicated to the AE prism models.