Hi HillbillyxX,
a clock normally has nothing much to do much with military precision, which is waaaay off in many cases.
Here is a circuit providing an accurate 1Hz signal if the oscillator circuit is tuned precisely. The frequency of 32.768KHz is most commonly used in wrist watch circuits and is fairly accurate if the watch is worn day and night for least temperature changes - hence crystal frequency changes.
I'd be pretty much disappointed if my timepiece were off more than 1 second per month. It cost me 350€ and is a PULSAR (daughter of SEIKO) with a big advantage over all clocks I had purchased before: The battery takes care of accurate time keeping for a period of six years before replacing it.
The PCB just requires 1.55X1.7625inches.
To maintain precision the circuit should be kept at constant temperature (e.g. arm pits
If you want to build the circuit as shown please PM me for the Eagle files - free of course. What else?
Regards
Boncuk