Vintage 18 3/4" Freshwater 7-8mm Pearl Necklace w/ 14K Gold Ball Clasp

Pre-owned.  From an estate.  All pearls are differ slightly in size but most are about 7mm to 8mm widest.  Clasp is marked "14K'.  Unknown maker.  Wearable length is about 18 3/4". Hand knotted.