I don't know the CD number for this insulator, but it is one of the larger ones. It is marked Isorex on the front and 35/1 on the back. It is a very dark, almost black glass, green. It has some scratches on the front and some more on the back, but they aren't too bad. Also, the inner skirt is cracked, but the crack is hard to see. As you can see, the insulator displays great. How about $50 plus shipping? Thanks!