I picked up several insulators yesterday at the new antique mall here. This one I found very interesting. It is a CD 154 RDP in a very vibrant and fizzy Hemingray blue, (color doesn't show in this photo). The embossing is missing the Y and the dash, and the 42 is very faint and below the line where it should be. I looked very closely with a jeweler's loop. The Y and dash are not there, not even in ghost form. The 42 is just off the frame to the right and below line. I can't get it to photograph, so I didn't try to include it in this pic. Also, this piece appears to be hand engraved unlike any other Hemingray 42 that I have seen.