The pictured insulator is a damaged light aqua CD 158.9 Boston Bottle Works Screw-top. This is slightly a taller version than the Screw-top shown in [id=80048694]. Comparing this Screw-top to the shorter one shown in [id=80048694] you will notice that the taller version has five threads on the threaded portion and the shorter version has only four threads. Also the wire groove on the taller version is narrower than the shorter one. The glass in this specimen is also cruder. The top of the threaded projection of this insulator does not have the triangle common to most of this style. The top is concave and pitted. I was told when I acquired this insulator that it had been dug from the middle of town in Columbus, Georgia.