These pieces were pyroglazed at the factory. This is the same type of application used on bottles so I think either someone was fooling around at the factory and decided to do some insulators (my vote for most likely) or the company was experimenting with this application to provide marker insulators. I've seen an article with color pictures that showed Hemingray experimented with special applications in colors like this but that was much earlier in the century. These are all CD 214 Armstrong's No 10 // MADE IN U.S.A. [A in circle] [mold number] 52 [8 dots]. The white one is mold 3 and I'm asking $75 plus postage. The cream colored one is mold 18 and I'm asking $100 for it. The blue one is mold 12 and I'm asking $125 for it. I don't have a duplicate of the red one so am keeping it but it is mold 17.