First flashlight I loved was a red Eveready 2xAA side by side light, no lens, no reflector, just a U-shaped white plastic piece to hold the bulb, you slid the whole side off to change the batteries. Must have been about 1975 when I got it, and I used to read under the covers until it was so dim I could not even see a whole word at a time.
I have checked the flashlight museum, cannot find a reference to it.
Another one I loved at that time, which I was not allowed to use, was also a plastic Eveready light, which took a 6V lantern battery underneath that screwed on to two pillars. I inherited that and still have it. You cannot get those batteries and my daughter dropped it and broke the reflector but I now run it with a 600 Lumen 12V downlighter mounted against the glass, and a 12V 7Ah battery strapped onto a slightly shaved body with Velcro. It was a powerful spotlight in its day, now it is a rechargeable floodlight.