This is a CD 126.3 embossed "11 / W. Brookfield / 55 Fulton St N.Y." on the front dome and "Feb 22 1870 / Jan 25 1870 / Jan 14 1679" on the back dome. The color is a medium mint green with milky swirls. This insulator was found on the Central of Georgia Railway telegraph line which ran West from Fort Valley, GA to Columbus, GA. There were many aqua to blue aqua CD 126.3's on this line and this was the most common embossing. The CD 126.3's in nice green colors were rare, but there were a fair number of green to olive green CD 126's which were found on this line.