This antique star insulator is a stunning shade of turquoise-teal, with eye-catching bubbles and wrinkles in the glass. According to insulator.info, Star Embossed insulators are a mystery! Why they were made, when, where and by whom remains open to investigation. Attempts to correlate STAR insulators attitudes, size and colors with manufacturers has proved inconclusive. This star insulator is CD 106, nicknamed PONY insulators, and was designed to serve primarily rural telephone systems.