Bürk masterclock
oliverb,
I bought mine on Ebay, 6 off them.
These are very quite in operation and don't clunk as the English 30 seconds clocks with the gravity weight.
Escapement is via graham dead beat escapement.
Get one with the M5 invar pendulum rod which can run at better than ± 0.4 seconds a day on a solid wall and reasonably constant temperature.
I got 4 Bürk master clocks about 2 meters away from our lounge and my wife doesn't complain so that should give you no problems for noise in your house.
Look for the ones with the 2 mercury switches on the left hand side of the mechanism, these will provide the alternating polarity one minute pulses to drive the slave clocks.
These have an inbuilt transformer 220 / 24 volts and rectifier.
Most have the 24 hour programming wheel on them as well which operates an other mercury switch which can drive an external alarm if you wish.
i use it as a pre warning for the kids to be ready for school during school days, a week switch cancells the weekends.
Every minute the fourth mercury switch, behind the dial, drives the winding motor and keeps the weight up for maximum reserve in a powercut.
after power is restored the clock adjusts all the slave dials automatically.
In German these are called Hauptuhr or Mutteruhr
Ebay Germany (Deutschland) will be the best place to get them
Some Turmuhrs are sold too but these haven't got the mercury switches and operate directly on 220 - 240 volts.
Regards from the down under
Raymond RF.