This was a piece I picked up last weekend. My daughter received a job offer from John Deere in Des Moines, Iowa, so we loaded up the U-Haul and drove out there. Believe me, it was painful not being able to stop at the many antique malls along the interstate! We got her all settled in her new apartment by Saturday, so after breakfast Sunday morning she agreed to accompany me to a local mall. The were quite a few insulators, and I discovered this Pittsburg product in one of the cases. Now I just need the one marked Johns-Manville.............:)