(Updated 8/15/19) How common are CD 162 Signals with a near complete flat dome on them? Found this one in the wild and the only one I've ever seen

Petticoat (front)

H.G. Co. Patent MAY 2 1893

With info answers from Brent Burger he said that this one was uncommon. Made during the Stamp period and this one is odd with earlier embossings