Yes those marks on the genealogy page do not match, but I was looking at a slideshow of a book called "Early American Silver Marks" by James Graham Jr. copyright 1936, it is freely available online, and the mark shown is a good match for my hallmark, an "IT" in a regular-looking font inside a circle.
I have yet to encounter it, though, all his works are in the museums and they only show the object not the hallmark.
Probably now beyond my (non existent!) knowledge of US silver. Any attribution is reliant on Graham's book being correct (and it is not one I am familiar with, although that doesn't mean anything). I'd await a more expert opinion.