South Sea pearl necklace with 2 bayonet interchangeable clasps,

Necklace of South Sea cultured pearls graduating from 7.6 to 9.8 mm, L: 43 cm, with 2 bayonet changing clasps, 1x pearl and 1x EHINGER SCHWARZ 'Charlotte' with mother of pearl disc and steel/gold head with brilliant-cut diamond, 20th/21st century, signs of wear, with sales receipts.