The picture I posted yesterday was kinda sorta ok for my lousy eyesight. . . blurry. . .so . . .here is a better picture of the bubble on the rear of the insulator. . .if you look close at the wire groove. . .you can see a little rust there. . .I love insulators that have evidence of use. . .they are so fragile. . .to find a nice piece without to much battle damage is cool . . .

nearsighted dog ^..^