Vintage opera Pearl necklace

7-8mm Pearl necklace. Endless rope style and opera length. Strand is 100" and the necklace is 50". These pearls have a creamy color and beautiful lustre. Wether these are salt or fresh water is unknown. They are naturally cultured though. Unsure of time period. Pearls are so heavy they have double the amount of silk string. Some knots tightened overtime and have traveled inside of the drill holes, they still hold most of them in place nicely.