This insulator is a CD 301 with no embossing and has the 4 ribs between the outer and middle skirts. It is a dark aqua color. The insulator has a 1 1/4" factory open bubble on the middle of the body, and a 1" outer skirt base chip. These CD 301 Trolly insulators are very hard to find in decent condition. It displays very well as shown in the photos. Priced at $550.00 plus shipping.