Here are three of the twelve lights listed in the 1976 Industrials catalog for Eveready. Eight of the twelve lights included the red Safety Glow diffuser by the lens.
1) #1359 is a working 3D flashlight with a heavy duty safety(permissable) light with ring hanger.
2) #1251 is a working 2D flashlight with a heavy duty light switch guard, replaceable switch and ring hanger.
3) #308CT is not working. It is a 2D flashlight with a continuity tester attachment. The continuity tester has corrosion on the receiving end of the plug and is not functioning. I got the flashlight to light up by putting a metal strip across the battery end to overide the non functioning tester portion of the flashlight. Sold as is.
Batteries not included.