This'd be my most recent antique store purchase, and one of the strangest things I've ever seen attached to an insulator. With the #1 strangest things being a wooden duck..... don't ask! I spotted this guy at the local flea market, and the seller willing handed it over for $9 - two less than the initial asking price of $11. The attached insulator is a THOMAS signal, as can be seen in the photo. Dry process, I think. The Bracket is marked "CLM" / "1989" on the top bracket segment that can be seen in the photo. The rear wire groove clamp piece is embossed "CLM 1990". Two consecutive numbers. I'm guessing they represent two components designed to be used in conjunction with each other. Now, the question is; what is it? I'm guessing, with the heavy hardware taken into consideration, it was a substation piece. And a fellow collector, as well as the dealer who sold it to me both agreed. But what do you think? -------------------------------------------------------------------------------------------------- Well, Several collectors have come to an agreement, and have taught me that this bracket is designed to insulate a suspended street lighting fixture from the bottom of a crossarm. The machine threading is designed to screw into a piece of hardware attached to the crossarm, and the fixture itself then screws into the bottom of the insulator. I think it's great!