I live in Illinois, in an area where old insulators are easy to find & so common that I've aquired over 100 just from walks along the old tracks over the years. I have sold some, swapped some, given many away..
Most have the year on them. Blues, greens, clears, amber, white.
Looking to swap...
I live in Illinois. I walk the old railroad tracks by the river & find them all the time. Many are still on the poles. You in Illinois? I have a ton of old insulators & would be happy to give you some. :-)