This insulator is a CD 300 embossed on the front; No 17 F. M. Locke Victor N. Y. and blotted out patent dates on the back. It is a light aqua color. The insulator is in near mint condition with a 1/2" flake on the inner edge of the outer skirt in the back and some inner edge nibble flakes on the middle skirt. A good looking larger power piece that is heavy. Priced at; $50.00 plus USPS Ground shipping cost. Thanks.