Vintage 18” Gold Necklace Chain Solid 14K with Hallmark. The mark on the other side the clasp I could not decipher - see the last photo. It weighs just 1 gram on my digital scale but I am sure it is slightly over 1 gram so it is a thin type necklace. We have owned this for decades. I guarantee it is genuine solid 14KT, NOT filled or plated.