CD 156 (base) AM INSULATOR CO // PAT SEP 13 1881 -- light green -- this has a clean flat 2" chip up from the wire groove on the back (see pic) and a small inner skirt chip - note there is also an underpour on the base not to be confused with the small chip. This style seems much tougher to find than it's CD 156.1 cousin. Figure $85 plus actual postage.