I can't find my foreign insulator book right now, so sorry I don't know the CD number. The insulator stands 5 inches tall. In the wire groove, it looks like a piece of something was in the glass and expanded and broke a little piece of glass off. I think it might be a metal wire that's in the glass. The total length is 1/4 inch long, and the insulator can be easily displayed without it showing. Also two very little pings, and some light scratches. I can get more pictures of the insulator, if needed. There are also some carbon lines in the wire groove. In the photo it looks like a bad scratch right below the wire groove, it is not, that was done by the camera. Was $30, now $25, plus shipping. I can do trades also.