I just got an old wall clock that used to be my grandfathers. The movement it uses is an electro-mechanic Junghans Ato-Matic movement that looks interesting. I tried to just replace the battery but it would seem that was not enough and the clock stops after just a minute or so. I suspect it needs some oiling and cleaning or something.    So my question is, does anyone know anything about such a movement ? Is it possible to "service" it ? If not, how do I choose a replacement movement that