Holy CRAP, guys. I just stumbled across this thread. How old are those gem lights, anyways?
I'm bugging right now. My dad's had this penlight for AGES, probably at LEAST 20 years if not longer. And it is still in fabulous shape. The pushbutton tip on the gemlight, does it screw down into itself, locking the light on? And on the main body of the light, above the clip, is there a slanted spiral groove making three lines where you see both tips and a middle line (a double line if you can't see the end of it)?
I can't tell you how often I've looked at this and wondered if it were a prop, like the imperial code cylinders. So much, in fact, I kept it when my parents got divorced 17 years ago.. I'm absolutely gobsmacked right now. Right under my nose, all my life.. :lol
(Oh, and the thing is absolutely straight/parallel, the taper is a trick of the light and perspective.)