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 movement, and the mechanical caliber number starts with “9S”, the spring drive caliber number starts with “9R” and the quartz caliber numbers are indicated with 4 digits starting with “9F”, “8J” and “4J”.
How to check the caliber number
The four-digit model number on the case back is the caliber number.
Water resistant performance
Case Number
<See-through case back>
<Diver’s watch case back>
【Ex.】9RA5-0AA0
Caliber Number
Water resistant performance
Water resistant performance
Case Number
Case Number
<See-through case back>
<Diver’s watch case back>
【Ex.】9RA5-0AA0
【Ex.】9RA5-0AA0
Caliber Number
Caliber Number
The above illustrations are examples and may differ from the case back of the watch you purchased.
Water resistance
Refer to the table below for the description of each degree of water resistant performance of your watch before using.
|
Indication on the case back |
Water resistant performance |
Conditions of Use |
|---|---|---|
|
No indication |
Non-water resistance |
Avoid drops of water or sweat |
|
WATER RESISTANT |
Water resistance for everyday life |
The watch withstands accidental contact with water in everyday life WARNING Not suitable for swimming |
|
WATER RESISTANT |
Water resistance for everyday life at 10 (20) barometric pressures |
The watch is suitable for diving not using an air cylinder. |
|
DIVER’S WATCH 200m |
The watch can be worn for diving using a compressed air cylinder and can withstand water pressure to a depth of 200 meters. |
The watch is suitable for genuine scuba diving use. |
|
DIVER’S WATCH 600m |
The watch can be worn for diving using helium gas and can withstand water pressure to a depth of 600 meters. |
The watch is suitable for saturation diving. |