Hi WB, these 2 necklaces are constructed mostly of ancient bangle bracelet bits (curved tubes with bumps) along with a few reworked ancient beads between. I believe they were coming out of Afganistan, 5 or more years ago, and occasionally can be found in some of the bead shops. The bangle bits were originally sold as Roman era, but later changed to the Islamic period (800-1200AD) due to some larger waste site finds.
Neat finds!
Jeff