Circa 1970s Terry Williams Navajo buying Turquoise Sterling Stick Pin

buying Gorgeous sterling silver stick pin with a beautiful piece of robin's egg blue colored turquoise set into a swirled leaf pattern. Lovely patina! Marked Sterling and TW, Terry Williams's signature, on the back. The head of the pin measures about 1/2" by 1/2. The stick pin measures 3" in length.