I have a Waltham 1894 made in 1924 open face. It has a chain on it with an oblong rectangle shaped closed loop at the end. One side of the loop is decorative. It looks like it would be a clip to attach to clothing, however it does not open. I am curious how this is intended to be attached to clothing, or is is missing another piece that would work together with the closed loop? See included pictures. Thank you for your help.