Antique undyed red coral 5 mm hand knotted bead solid sterling silver necklace

This is an amazing antique undyed / natural Mediterranean red coral 5 mm hand knotted bead necklace with a solid sterling silver fish clasp. The beads are 4.85 mm near the clasp to 5.65 mm at the center of the necklace. It measures 31.5 inch long and weighs 19 grams. Can be worn as a long single strand or shorter double strand. It still has its original silk knotting which I wouldn’t change (to prove its antique status). The fish clasp is signed sterling on its side. There are a few tiny natural holes and cavities in some of the beads. The beads also have natural color variation seen in untreated antique coral. In excellent vintage condition.