Vintage W. Brookfield C1 green glass insulator embossed “W. Brookfield New York.” Made in USA. Classic dome-top shape with thick glass and concentric ridges. Used on early telegraph and utility poles. Displays natural age marks like bubbles and streaking from original glassmaking. A great piece for collectors, decorators, or industrial history enthusiasts. See photos for condition.

Early glass insulators often show bubbles, streaking, “snow,” and surface creases from the original manufacturing process. These natural marks weren’t considered flaws at the time, since the insulator’s purpose was purely functional. Today, collectors value these authentic signs of age and early glassmaking, as they add character, charm, and historical appeal to each piece.