You are viewing a heavy solid Sterling silver bicycle chain style necklace made in Mexico in the 1970's. The necklace measures 17" (wearable) long by 8 mm wide at the back. The center plate is inlaid with natural Malachite and Black Onyx; and, measures 1" by 1 1/2". The necklace is marked: 925 Mex. It has a locking style clasp. It lays flat and conforms to the body. It weighs 73.4 grams.