Here's a very well preserved copy of the 1975 OBX or Old Bottle Magazine with a great article written by Joe Maurath, Jr. when he was the editor of the Insulator By-Lines. It's an article about blue glass insulators and their manufacturing. It covers cd #'s from 102 to 1070. Very well written and very informative. If you are into blue glass this is a great reference. I will offer it for just what I paid for it, $5 plus shipping. Send me your zip and I will send back the shipping cost to you. First email get it.