Here's a cool insulator embossed PAT'D (first line) R.B. MERSHON (slightly weak but readable; the "By" was hard to see). There is an interesting spot next to the left mold line that looks like a blot out with "((" blotted out, Perhaps a Denver specialist is familiar with this?

1 inch stress line behind the embossing and approx 2 inch stress crack that follows a straw line in the dome (perhaps indicating factory origin?) 3/4 inch paper thin flake inside outer skirt and 1 inch sliver base chip. Displays nicely at the cool slashed price of $25 plus postage to the first email. Thanks!