This is a CD 134 American Insulator Company in light mint green. The actual embossing is AM INS. CO. PATd SEPT 13. 81 . . It was found on the Central of Georgia Railway telegraph line near Macon, GA. Although not common, there were many of these found distributed through out all the various sections of the Central of Georgia which were hunted. I probably traded around 30 + into the hobby. Most were shade of aqua. I think there were about five or six in the aqua shade for every one found in this light mint green shade. In natural back-light this mint green color fades out to a more greenish aqua shade. I took this photo using fluorescent light in order to show the actual mint green color shade.