This is a well made chain to wear alone or with a pendant (see RH926) or with a brooch that you can turn into a pendant using an adapter. The chain is 22 1/2" by 3/16". The box clasp is marked TM-49, Mexico 925. The TM indicates that the necklace was made in Taxco, by the 49th person registering with the surname beginning with M. It was made after 1978. 38 grams or 1.35 oz. Excellent vintage condition.