Seiko 8J55, Operating Instructions Manual, Page: 4 / 14

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English
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NAMES OF THE PARTS
About the caliber number
The caliber number is a four-digit number that indicates the model of a
movement (mechanical part of a watch). The Grand Seiko watch is mounted
with an exclusive caliber. The mechanical caliber number starts with “9S”, the
spring drive caliber number starts with “9R” and the quartz caliber number
starts with “9F”.
※ Some quartz caliber number starts with “8J” or “4J”.
How to check the caliber number
The four-digit model number on the case back is the caliber number.
Model Number
<Regular case back>
9F83-00A0
9F8
3
Caliber Number
(Ex.)
Date
Hour
hand
Minute
hand
Second
hand
Crown
Second click position
(time setting)
First click position
(date/day setting)
Date
Hour
hand
Minute
hand
Second
hand
Crown
Second click position
(time setting)
First click position
(date setting)
9F83
9F82, 9F62, 4J52
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CHECK THE CALIBER NUMBER
※
The above figures are examples and may differ from the figure on the case back of
your watch.