Vintage copper shell and bead necklace hook clasp

really cool vintage metal beads and metal scallop shell necklace. I believe it to be oxidized copper as it has a pink tint. the beads are metal as well in different shades. it's not gold or sterling as i tested for those. i leave cleaning to buyer as some prefer the patina and character of vintage jewelry. 18in plus the size of pendant. please see pictures for details and measurements and condition other items are display only bundle for savings vintage, industrial, brutalist, multistrand, unique, eclectic, rustic