This is a classic repoussé necklace by Ricardo Salas, nephew of Matilde Poulat, an influential jewelry designer who opened her Mexico City workshop in the 1930s. In beautiful condition. 20.25 inches (51.4 cm) interior circumference, 162 grams, circa 1965-1975. Marks: Matl, m.regis, 14-2093, mexico, 925, ms-12, Ricardo Salas Matl