This CD 121 is dome embossed PAT'D SEPT 19th 1899. There is a very shallow base chip that spans two of the ridges (about 1/4"in length). There is also a fine line internal crack that completely circles the wire groove. It does not appear to come to the surface at any point On the plus side, it's a good looking insulator. Even has a floater in the dome! Asking just $20.00 plus actual shipping cost. PayPal, friend mode, or check.