This great looking insulator is embossed ER on the front lower skirt for Erie Railroad.  Above that is embossed W Brookfield 1 Fulton St NY and the rear upper skirt Cauvets Pat July 25 1865.  There are a few very shallow base slices that can be seen in the photo.  One or two small pings and a strong mold line over dome. There is a nice milky ribbon in the base.