> CHECK THE CALIBER NUMBER AND WATER-RESISTANT LEVEL

CHECK THE CALIBER NUMBER AND WATER-RESISTANT LEVEL

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.

9RA5_Performance and type + Performance and type 9RA5 A2

Water resistant performance

Case Number

<See-through case back>

<Diver’s watch case back>

【Ex.】9RA5-0AA0

Caliber Number

9RA5_Performance and type V + Performance and type 9RA5_A2 V

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
10 (20) BAR

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
FOR SATURATION DIVING

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.