Clasp is oversized, in brass. Necklace is 16.5" long, the spike pieces are 2" long and 3/8" at the top tapering down at the points. Only one piece has numbers on the side, there are no other markings. However, many years ago I had this same necklace and it had a jump ring that was marked Germany. This one however has no other markings on it. Tested with Simichrome and 409 as positive for Bakelite. Encircles the neck beautifully and is quite a show stopper.