This view pretty much speaks for itself! Joe has told me that these (embossed-top) Autovalve Arresters made by Westinghouse came in a variety of sizes. They were made from the late 20s into the early 40s. Overall length in according to protected line voltage. Most are light blue, brown or light gray in this design. Please note that none of these have anything to do with the light gray porcelain that came out in the mid 1960s! Anyway, what a super neat go-with with the lightning bolts so proudly shown on top of their caps!