Here's a new one for the Hemingray embossing specialist in you. This is a CD 106 Hemingray No 9 with the patent date on the rear in the older hand script mold engraving. These are hard enough to find in the script type embossing, but this one is a previously unreported embossing error or quirk with the A in May missing the middle bar. Same insulator pictured here [id=262642256] and here [262642636]