Vintage 925 sterling silver large classic chain necklace, 20" long

Vintage sterling silver chain necklace. Solid and heavy, over 15.5 grams in weight. 20" long. Stamped 925 on the clasp and on one end. Also has a makers mark FNA. In pre-loved condition with some minor surface scratches. One of the links was replaced, as shown in two pictures. This is not too noticeable because it is on the side of the necklace, not in the center. See pictures for details and condition. Unisex, so will be listed in both men and women categories.