Wasn't sure whether or not the Star insulator on the left was a CD 103 or 104 when I picked it up at a fleamarket yesterday. Would have picked it up anyway regardless being I don't have any Star 104's in my 104 collection. After getting home and comparing all I do have and comparing to price guide I'm still not positive what CD it is. The measurements are right on as to what a 103 should be according to book. In my pic the New England Tel & Tel Co. is the shortest I have and probally the shortest made by them or whoever made. What do you think it is? Please explain why in your reply. Thanks!!