Remembered this insulator that I found some time ago. . related to the CD 154 topic that has been around for several days. Looks like a common 154 Hemi til you look at the base. Surprising that this insulator survived considering the quality control of the Hemingray company. Just goes to show that you need to look at the common stuff also!

Will post a picture of a close up of the base in a few minutes. . .

maddog ^..^