Here is a side Tang lightning rod insulator. Has shallow Chip off base, and fingernail size Chip above the Tang. Has some silver paint on base. The spool is 1 5/8" tall and 1 5/8" wide. Not sure what CD this one is. Doesn't look like anything in the book. Several chips off base. Base is flat not indented. Indent on top. And two CD 188 Pat'd Nov 23d 1886 mine insulators. Both are Heavily cracked and chipped. Asking $50 plus priority shipping.