Hook And Box

This clasp was typically used in the 1920s and 1930s, you see it a lot on old beaded glass necklaces. It's comprised of a 'fishhook' that latches onto the bottom of the clasp and then is pushed inward to secure it. To remove, pinch the exposed bottom of the hook and pull it towards you, when it catches on the bottom of the clasp, simply turn the hook horizontal and slide it out.