The PG lists several embossing errors for the A T & T, CD 121s, like a missing bar in the 'A', but here is one I did not see listed. The center bar of the 'E' in the first 'TEL' is missing. I know there are collectors out there that enjoy this kind of stuff so here is one to keep and eye for if you don't already have it in your collection. I actually picked this $2.00 insulator up because it has a milky thread in the skirt. Didn't see the error until much later. Second picture shows the whole insulator.

From Roger Poole

Looks like the center cross bar was meant to be there. If I look close enough I can see where it started at the right center side of the vertical line. I don't believe they are as heavily embossed to begin with so mold paste build up could have caused what looks like an error.

Roger