A complicated chain design marked TS-79, 925 and Mexico. That mark was shown to belong to Juan Vazquez Sandoval in the book Mexican Silver by Morrill and Berk. The length is 16-3/4" by a width of 5/8". This heavy sterling necklace weighs 132.6 grams. The clasp is a box catch and it is a little tight to open and close, a jeweler could loosen it a bit to make it easier to use.