Was given a box of insulators recently and in addition to the Hemingray CD 106 previously posted, I pulled out these two mint examples. A CD 197 [020] and a CD 170.1 [020] No Embossing. Fortunately I didn't have either of these versions on the shelf. Not particularly valuable but they both cleaned up nicely so thought I would post their picture. There was some porcelain and the next picture shows a nice U-291 with an incised Lapp Insulator Company marking. It is nice when signals are marked (most I encounter are not) and I don't think I have seen this glaze/signal with this marking before.