I found this giant Pettit Point cluster ring. The shank has stamp work on it. I am hoping this is natural untreated turquoise. A couple of the stones have turned colors. I don’t think it is that old. Also I have not seen this Hallmark before and have not been able to find it in any of my books or online.
Edit:This is the work of Erecka Lee. She is the sister of Clarence Lee. As explained further down.