Do any of you own an antique chiming clock? I have just bought an old clock. On the inside it has ( Hac Wurttenburg Germany ) I don't know anything about looking after it, the seller couldn't tell me much either. I need to know how often to wind & what the two key holes are responsible for on the front of the clock. I have presumed one is for the chime & one for the time, but which is which? I'm a bit nervous about winding it at the moment.