Got another call from my ad in the paper yesterday. An older gentleman (86) who said he could remember his mother using this as a doorstop when he was 5. Told me he had one insulator that had the marking ACL-1 on it. I told him I'd be out to see it this morning. After googling the marking and finding a page on Elton's web site (http://www.r-infinity.com/flwebpage/Lima_1.htm) that discussed it, I couldn't believe that's what it was. But, that's what it was. Said his family lived in Western PA his whole life and he has no idea where his father got it from. See the marking here [id=472654016].