I recently found this old blue VICTOR suspension insulator in Arizona. Note the logo under the rim. That would date it to around the time the line was upgraded to 115 KV, 25 cycles, about 1912. The line originally ran at 45 KV, 25 cycles with M-3735 pintype multiparts around 1908. After hiking this line a few years, I have only been able to find this one. None appear to be in use anymore.