These pieces are from a bunch of insulators I bought from a Craigslist add a couple of days ago. I think the two tall ones are U-18s (the dimensions match), and I'm wondering if the glaze is what is called rust and mustard in Elton's guide. The glaze has little shiny flecks in it, like a U-356 Thomas piece I got early in the year. The short one is a U-40a, I think. I'm not sure if the brown is a dirty haze still on the piece, or if it's actually the color of the glaze. There is a bit of the same color on the edge of the dome. If anyone thinks I'm wrong on the ID or can clarify the colors, please let me know!

Elton has told me these are U-17s.