VTG Hemingray 18-40 CD 128 C.S.A Clear Glass Telephone Insulator. It has no chips or nicks, glass is very nice with minor surface wear. Glass is clear but does have a lot of very small bubbles in it. Insulator still has the screw in insert. I know nothing about insulators, so if you have any questions, or if I have stated something that may be incorrect, please ask me. I am happy to send more pictures and answer questions.