Vintage Southwestern Silver Swirl Necklace

This sterling silver swirl or spiral necklace is likely made by a Navajo artist like Mildred Parkhurst. I do not see any stamp or markings. The spirals or swirls on the necklace are 3/4" by 7/8". The silver swirl necklace has a hook clasp and can be worn from 13 inches to 19 inches in length.