This wet process beehive-like porcelain insulator measures 3" wide x 3-7/8" tall. I cannot find it in Elton's unipart book. The wire ridge looks like a U-114, but this is clearly not that. At first, I thought it might be a U-121, but the measurements don't quite match; the wire ridges are different; and the U-121 doesn't have an inner skirt while this one clearly does. I also thought it looks a little like a U-274C or U-278, but again, the measurements are not right. Any help with a definitive ID is appreciated.