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36
Caliber
number
Battery
(SB-) Battery life
9F86
AN
Approximately
3 years
9F83
9F82
9F62
9F61
4J52 AG
4J51 AC
8J55 AN
Approximately
5 years
The battery life is the estimated life for a
watch with a new battery installed. The
battery in your watch at the time of
purchase was inserted in the watch at the
factory for performance checks. It may run
down earlier than the above-specified
period.
When the battery nears its end, the
seconds hand moves at two-second
intervals instead of normal one-second
intervals. The watch remains accurate while
the seconds hand is moving at two-second
intervals.
Frequency of
crystal oscillator 32,768 Hz (Hz = Hertz...Cycles per second)
Loss/gain
(Annual rate)
±10 seconds when used on the wrist within a normal
temperature range (between 5 ºC and 35 ºC) for
approximately 8 hours per day.
Monthly rate of loss/gain may amount to approximately
2 seconds depending on the condition of use.
Operational temperature
range Between –10 ºC and +60 ºC
Driving system Step motor
IC (Integrated Circuit) C-MOS-IC: 1 piece
The specifications are subject to change without prior notice due to product
improvement.
SPECIFICATIONS (MOVEMENT)
LEAP SECOND
Normally there are 86,400 seconds in a day. Due to a slight change in the earth's
rotation, an extra second may be added to one day during the year. This is called
the leap second. Every year the decision is made whether such an adjustment is
needed. When the adjustment takes place, the standard time should be corrected
by delaying the standard time one second. To keep your Grand Seiko watch
accurate with the world standard time, adjust your watch to a time signal
whenever such adjustment is made. According to the information from the
observatories all over the world, the standard time is delayed one second
simultaneously throughout the world by the Greenwich Royal Observatory. In the
Greenwich Mean Time, an extra second will be added to the one minute between
11:59 p.m. and 0:00 a.m. either on December 31st or on June 30th. However,
the adjustment may not be made in some years. Please check by a newspaper,
etc. whether such an adjustment will be made or not.
20


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