I have a whole bunch of them. They are possibly a bit older (70s, 80s) judging by other contents of the junk box they are from.
There are no labels of any kind, but on the top they have stripes that look hand painted.
For at least some of them the resistance roughly corresponds to the color code.
So, I'm just curious why I can't find anything about these on the internet.
I've had to buy some in the past for railway equipment, probably more 50's/60's than 70's and 80's