The following is a very early CD 133 W. Brookfield signal style which was found on the Central of Georgia Railway telegraph line. I would refer you to the posts by David Wiecek for the style [260] mould variant. This insulator is very heavy and is embossed W. Brookfield / No. 55 Fulton St. on the lower skirt and "Cauvet's (arched) / Pat / July 25 1865" and is light blue aqua. I will call this style 1 and is the mould variant which David makes reference too.

The main difference between this one and David's mould style 2 is that the lower skirt has a concave curvature and the embossing is slightly larger. These were found both North and South of Macon, GA and they all were {MLOD} and had a 7 mould mark with a large script 7 on the back skirt. I found about 15 or so which were mostly traded into the hobby. Most of them were the style 2 with the straight skirt.