Vintage Sterling Silver Mid Century Statement Swirl Design Necklace

One of a kind artisan silversmith made swirling statement necklace hand wrought mid century 1970’s made. Drapes down like a bib style , hook loop clasp. No hallmark but acid tested for sterling silver and with metal tester. Some rubbing, patina, blackening of silver bumps possible bending from age and use. Please refer to photos for condition and description Offers welcome