Engraving class at GRS & posey rings?

Hello, I am going to be taking the engraving class at GRS in April.
Does anyone have any comments on this class? I am also looking for
on posey rings. Can anyone direct me to a site or book
about their history and photos. Thank you for your help. I have been
enjoying reading everyone’s postings. I am working toward becoming a
jeweler. Lisa @dsampson