Here is a nice CD 135 Blue Chicago insulator embossed on the base "Chicago Insulating Co. Pat. Oct. 16 1883". This piece is in great condition with only a paper thin flat flake on one of the diamonds, ding on inner base and 3 or 4 pecks here and there, displays super. It has three raised dots as well. Asking $65.00 + shipping. PayPal using the "Gift Option". NOW $60.00 + shipping.