Back in the '70s when I was going to college, found a few of these on campus. Don't know where I've put 'em now, but they were interesting and still counted, at least for me, as a ring. My fingers are pretty thick, so bet I just didn't wear it on my pinky any more. House was broken into a few years ago, and it might even have been stolen then. Still nice curiosities though.
I remember some high school shop teachers would show kids how to make 'em back then. To me they usually looked pretty rough from all the bangin' with the hammer.