A lady with a garden store/antique shop told me she had a bunch of insulators I could have a look at. I went back to investigate a couple of weeks later. They were stashed in an old pickup camper, in boxes, all covered with dust. I went through them all and, as you would expect, they were mostly junk. I did find a few keepers, the best one shown here. Excellent condition, just a few chipped drips. This is the only one of these I've come across.