A clock is disclosed including a clock body, a clock drive mechanism mounted on the clock body, an hour hand and a minute hand driven by the clock drive mechanism, and a pendulum driven by the clock drive mechanism. The teeth have a proximal section starting from their anchorage inside the handle to a point of their total length outside the handle, where a distal section begins and extends up to the free end, and where the surface roughness of the former section is different from that of the distal section, which is microtexturized. Thus, a material waste is restrained and a yield can be improved. These supported Pt0-nanoparticles show efficient catalytic activity for the selective reduction of chloronitrobenzenes. Both the auxiliary portion and the retaining portion engage with the insulative housing. In some embodiments, migrating occurs is carried out only if non-degrading link is available.