Vintage Goldtone and Black Metal Braided Herringbone Chain Necklace Korea

Delicately braided fine herringbone chain necklace signed "KOREA." Due to its age, the stamp fails to clearly show the "A. " But, I have added photos of another Korea piece of mind to show the A clearly. You can see that the script is rounded the same. Although I could find no mark, I believe this necklace to be gold filled as that was a trademark of vintage Korean jewelry. Also, their designs were touted as refined elegance, and they were known to use braided or coiled chains. This necklace is 15" in length. I don't know the exact age, but it has been in my family for about 50 years. A lovely piece in excellent condition.