This unique 18k yellow gold chain has a longer open link. Each one is detailed with flat surfaces and ridged edges. It has a secure box clasp with a beautifully engraved design. The chain measures approximately 20" long and each link is 2 mm wide. It most likely dates to about 1910, and it is in excellent condition with no visible repairs or defects. It has a mark on one of the links that looks to me to be the "eagle's head" denoting 18k. The overall weight is 7.5 grams.