Here is a pure dumb luck find! For months I knew my dad's new neighbor was a lineman by trade but had never met him. We finally met yesterday at our family reunion. He said he saves interesting insulators when he comes across them. "Would I like to have one?". You bet! He told my son and I that he had three "yellow" ones that he was going to send to a buddy in Iowa but we could have one. At first I was expecting to see a porcelain. He pulled this out of a box and gave it to us.