For auction today is a very nice vintage German Zentra Schwebe Anker  mechanical with key wall clock, The clock has now been going for quite a while and the four rods have a very melodic chime to it, the clock chimes on the hour and the half hour, the hour chime lasts longer.  .  The back, as mentioned above, has exposed workings but due to the fact it is a wall clock this may be the reason why, I have seen online similar with exposed workings. This clock comes with its own key, the glass door to the front is hinged, to adjust the hands will require a manual process, the key is only for the wind and the chimes. The clock has to its rear three very small dimples or bun style feet, I imagine  this is to keep the clock from resting directly against the wall.