Quartz crystal used in quartz
watches vibrates 32,768 times per second
and the accuracy of quartz watches is
determined depending
on whether can keep this frequency. However,
there are
individual differences in crystal oscillator,
and some might not keep the
frequency stable due to changes
in the environment. With the quartz watch of
Grand Seiko,
are adopted only ones which cleared eventually
the standard after a three month
long aging process.
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