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Thank you very much for choosing a SEIKO watch.
For proper and safe use of your SEIKO watch,
please read carefully the instructions in this
booklet before using it.
Keep this manual handy for easy reference.
* Length adjustment service for metallic bands is available at the retailer from
whom the watch was purchased. If you cannot have your watch repaired by
the retailer from whom the watch was purchased because you received the
watch as a gift, or you moved to a distant place, please contact SEIKO
CUSTOMER SERVICE CENTER. The service may also be available on a
chargeable basis at other retailers, however, some retailers may not undertake
the service.
* If your watch has a protective film for preventing scratches, make sure to peel
it off before using the watch. If the watch is used with the film on it, dirt, sweat,
dust, or moisture may be attached to the film and may cause rust.
EN 1
b
WARNING
Make sure to read the following instructions before use and strictly observe them.
b WARNING
When diving, never carry out operations other than those specified in this instruction manual. Mishandling
of the product and misunderstanding of the displayed content may lead to a fatal or serious accident.
b WARNING
The diver’s watch is an auxiliary instrument which mainly displays the passage of time and does not ensure
the safety of a user. Use this watch while using the equipment (residual pressure gauge, water depth meter,
etc.) required for safe diving.
b WARNING
Never use this watch for “saturation diving” using helium gas.
b WARNING
Do not dive using this product unless you have been properly trained in scuba diving, acquired the requisite
experience and techniques for safe diving, thoroughly familiarized yourself with the operation and handling
of this product, and inspect all functions of this product prior to each dive.
EN 2
b
CAUTION
Make sure to read the following instructions before use and strictly observe them.
b CAUTION
Inspect the following items before diving (excluding saturation diving):
The watch is normally operating.
The remaining battery level is sufficient and the mainspring is sufficiently wound.
The rotating bezel turns smoothly. (The bezel rotation must not be too loose or too tight.)
Screws of the crown and other parts are reliably tightened.
No abnormalities such as flaws or cracks exist on the band or glass.
The band is reliably fixed (with spring bar, buckle or other parts.)
* If any abnormality is observed in the above items, do not use this watch for diving.
b CAUTION
Do not operate the crown or buttons underwater.
b CAUTION
As the use environment of the diver’s watch may affect not only the case or band but also the internal
mechanism of the watch, we recommend that you periodically request an overhaul for inspection and
adjustment approximately once every two to three years.
EN 3
CONTENTS
1 HOW TO USE
Handling cautions ............................................ 5
Precautions for diving (Please make sure to
observe the following.) .................................... 9
Before diving ................................................ 9
While diving ............................................... 11
After diving ................................................. 12
Structure of the case .................................. 13
Mechanical watch characteristics
(Hand-wound, auto-wound) ........................... 14
Names of the parts and their functions .......... 15
Screw down crown ........................................ 16
How to wind the mainspring .......................... 17
How to set the time and date ......................... 19
Date adjustment at the end of the month ... 22
How to use the rotating bezel ........................ 23
2 TO PRESERVE THE QUALITY OF YOUR
WATCH
Daily care ...................................................... 25
Performance and type ................................... 26
Lumibrite ....................................................... 27
Magnetic resistant performance .................... 28
Band .............................................................. 30
How to use the diver adjuster ........................ 32
How to use the diver extender ....................... 34
After sales service ......................................... 36
Accuracy of mechanical watches .................. 38
Troubleshooting ............................................ 40
Specifications ................................................ 42
EN 4
2


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