This pole was taken in Bluffton, Indiana where they still use the old series street-lighting with a porcelain loop insulator doing exactly want it was designed to do.

On this pole on the top crossarm shows two CD 230 Hemingray 512 glass insulators with the left one a D-512. The porcelain insulator on the far right is a U 399B loop insulator. The two lower glass insulators are more than likely CD 239 Kimble-830s.