Vintage Sterling Silver Peruvian Bib Necklace

Heavy sterling silver bib necklace is unmarked as far as I can see and has tested as sterling.  It features seven graduated panels of Aztec images, two camels and four human figures.  The necklace measures 18 inches in length and the center and largest panel measures 1 1/4 inches by 1 1/2 inches wide.  The weight of the necklace is 53.4 grams and it is in great vintage condition.