{"product_id":"vintage-at-t-co-aqua-glass-signal-telegraph-insulator-no-190-191-utility-line","title":"Vintage AT\u0026T Co Aqua Glass Signal Telegraph Insulator No. 190 191 Utility Line","description":"\u003cp\u003eVintage AT\u0026amp;T Co aqua glass insulator collectible featuring embossed A.T. \u0026amp; T. CO markings and classic communications utility design. Antique glass insulators remain highly desirable among collectors of telegraph, telephone, railroad, and utility memorabilia due to their historical significance and attractive display presence.\u003c\/p\u003e\n\u003cp\u003eThis piece is pre-owned and displays age-related wear consistent with decades of service and storage. Visible manufacturing bubbles, mold seams, internal glass swirls, surface scratches, and minor weathering are present. These characteristics are typical of authentic vintage utility insulators and contribute to their originality and collector appeal.\u003c\/p\u003e\n\u003cp\u003eThe insulator features a broad skirt profile with a rounded dome top and threaded interior designed for mounting on wooden utility pins. The embossed A.T. \u0026amp; T. CO marking identifies its connection to the American Telephone \u0026amp; Telegraph system, one of the most influential communications companies in American history.\u003c\/p\u003e\n\u003cp\u003eGlass insulators were critical components in early telephone and telegraph networks, preventing electrical leakage and protecting signal quality across long-distance communication lines. Examples bearing AT\u0026amp;T markings are especially popular among collectors focused on communications history and utility artifacts.\u003c\/p\u003e\n\u003cp\u003eIts attractive aqua coloration, substantial glass construction, and historic embossing make this piece ideal for display in collections, offices, libraries, workshops, and Americana-themed interiors. The visible manufacturing characteristics and period styling reflect the craftsmanship of early industrial glass production.\u003c\/p\u003e\n\u003cp\u003eAuthenticity and identification are based on visible embossing and design characteristics. Buyers should independently verify exact model designation, age, color classification, and production period before purchase.\u003c\/p\u003e\n\u003cp\u003eDid You Know? AT\u0026amp;T's telephone network became one of the largest communications systems in the world and relied on millions of glass insulators throughout its expansion.\u003c\/p\u003e\n\u003cp\u003eThis is an authentic AT\u0026amp;T item. AT\u0026amp;T is a trademark of its owner. California Auction Company is not affiliated with or endorsed by AT\u0026amp;T. This item was sourced legally through secondary markets, estate or yard sales.\u003c\/p\u003e","brand":"ROY STOCKTON","offers":[{"title":"Default Title","offer_id":46618324369607,"sku":null,"price":20.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0735\/4633\/4407\/files\/20260530_105741.jpg?v=1780416975","url":"https:\/\/209marketplace.myshopify.com\/products\/vintage-at-t-co-aqua-glass-signal-telegraph-insulator-no-190-191-utility-line","provider":"California Thrift \u0026 Collectibles","version":"1.0","type":"link"}