Another great CJOW hit my inbox a few days ago. In the porcelain section was a discussion of these insulators. I took this photo immediately after Springfield, Jeff Markwart and I were trying to identify the U number of the Cinnamon piece in the center. I thought I had a blue one with the same profile, but it turned out to be the one on the right, what is now U-240A. Left to right: U-241B, U-240, U-240A