9/24/2023 0 Comments Astatic serial number![]() The large screw in the middle of the back plate of the earlier ones must have been to hold the early elements in place. On the later versions, the knurling is coarser, and seems to be partially filled in with the chrome plating. According to ads in the old magazines, they changed from the one inch thick head to the more modern 13/16" head in 1937.Īnother difference is that the knurling around the edge of the front and back plates of the older thick heads is more detailed. Not sure, never opened up the one I found. Also has a large screw in the center of the back plate, either for mounting the element inside or as a terminal. Doesn't have the plug-in base on the head, rather a small sleeve for running the wires out of the bottom. I don't think it's a full inch thick, but maybe. The original models are a bit thicker than the current model, tapped for spring mounting, and sport a large tag with a more fancy script layout. ![]()
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