5R series (5R77)
7R series (7R31, 7R87, 7R88, 7R89, 7R99)

BGSDD-2310

Thank you very much for choosing a CREDOR watch.
Only the unique melding of traditional Japanese sensitivity and state-of-

From the French “crête d’or” or “crest of gold” it signifies our commitment
to always being the very best.

Englishthe-art technology can bring you a watch of this quality and character.
Doing so is our passion. The CREDOR name is your guarantee.

We hope this CREDOR watch will be your favorite personal timepiece formany years to come.

Please read carefully the instructions in this booklet for proper and safe useof your CREDOR watch before start using it.
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 attachedto the film and may cause rust.

1

CONTENTS

b WARNING

To indicate the risks of serious consequences such as severe injuries
unless the following safety regulations are strictly observed.

Immediately stop wearing the watch in the following cases.
○ If the watch body or band becomes edged by corrosion etc.
○ If the pins protrude from the band.
* Immediately consult the retailer from whom the watch was purchased or SEIKO CUSTOMERSERVICE CENTER.

English■ HANDLING CAUTIONS ....................................................................................... 3■ PERFORMANCE AND TYPE ............................................................................... 4■ WATER RESISTANT PERFORMANCE .............................................................. 4■ CAUTIONS ON WATER RESISTANCE .............................................................. 5■ CHARACTERISTICS ........................................................................................... 6■ NAMES OF THE PARTS ...................................................................................... 6■ HOW TO USE ..................................................................................................... 10• Crown .............................................................................................................. 10• How to wind the mainspring (7R series) .......................................................... 11• How to wind the mainspring (5R series) .......................................................... 12• Power reserve indicator ................................................................................... 13• How to use (For Cal. 7R31) ............................................................................. 15• How to use (For Cal. 7R87, 7R88) ................................................................... 16• How to use (For Cal. 7R99) ............................................................................. 18• How to use (For Cal. 7R89, 5R77) ................................................................... 19■ TO PRESERVE THE QUALITY OF YOUR WATCH .......................................... 22• After-sale service ............................................................................................. 22• Daily care ........................................................................................................ 23• Remarks on 18-karat gold ............................................................................... 23• Watch body / metal bracelet ............................................................................ 23• Band ................................................................................................................ 24• How to use an adjustable three-fold clasp ....................................................... 25• Magnetic resistance (Magnetic influence) ....................................................... 26• Lumibrite ......................................................................................................... 27• Troubleshooting .............................................................................................. 28■ SPECIFICATIONS (Movement) ........................................................................ 30■ HANDLING CAUTIONSKeep the watch and accessories out of the reach of babies
and children.
Care should be taken to prevent a baby or a child accidentally swallowing the accessories.
If a baby or child swallows the battery or accessories, immediately consult a doctor, as it will beharmful to the health of the baby or child.

b CAUTION

To indicate the risks of light injuries or material damages unless thefollowing safety regulations are strictly observed.

Avoid wearing or storing the watch in the following places.
○ Places where volatile agents (cosmetics such as polish remover, bug repellent, thinners, etc.)
are vaporizing○ Places where the temperature drops below 5°C○ Places affected by strong vibrations○ Places of high humidity
or rises above 35°C for a long time
○ Places affected by strong magnetism or○ Dusty places
static electricity

If you observe any allergic symptoms or skin irritation

Stop wearing the watch immediately and consult a specialist such as a dermatologist or anallergist.

Other cautions○ Do not disassemble or tamper with the watch.
○ Please follow local government directions when disposing of the watch body.
○ Keep the watch out of the reach of babies and children. Extra care should be taken to avoid
risks of any injury or allergic rash or itching that may be caused when they touch the watch.
○ If your watch is of the fob or pendant type, the strap or chain attached to the watch may damage
your clothes, or injure the hand, neck, or other parts of your body.
○ Please keep in mind that if a watch is taken off and placed down as it is, the case back, the bandand the clasp will rub against each other possibly causing scratches on the case back. We
recommend placing a soft cloth between the case back, the band and the clasp after taking off
your watch.

2

HANDLING CAUTIONS

3

■ CAUTIONS ON WATER RESISTANCE

The case back shows the performance and type of your watch.

b WARNING
Do not use the watch in scuba diving or
saturation diving.

ESISTANTWATER RESISTANT 10BAR :Water resistant performance

10
BA

R

R
ER
AT
W
18

JA

PA

N

7R88-0000

000000

KT

MA

DE

IN

The various tightened inspections under simulated harsh environment,
which are usually required for watches designed for scuba diving or
saturation diving, have not been conducted. For diving, use watches
specifically designed for diving.

Serial number
Case Number
7R88-0000 :Caliber Number

b CAUTION
Do not pour running water directly fromfaucet.

○ Water resistant performance
Please refer to P. 4.
○ Case number
The number to identify the type of your watch○ Serial number
The number to identify your watch

The water pressure of tap water from a faucet is high enough to degrade
the water resistant performance of a water resistant watch for everyday life.

* The above illustrations are examples and may differ from the case back of the watch you
purchased.

■ WATER RESISTANT PERFORMANCE
Refer to the table below for the description of each degree of water resistantperformance of your watch before using.
Indication on the case back Water resistant performance
No indication

WATER RESISTANT

Non-water resistance

Water resistance for everyday
life

Conditions of Use

Avoid drops of water or sweat

The watch withstands
accidental contact with water ineveryday lifeb WARNING

Not suitable for swimming

WATER RESISTANT
5 BAR
WATER RESISTANT
10 (20) BAR

4

Water resistance for everyday
life at 5 barometric pressures

Water resistance for everyday
life at 10 (20) barometricpressures

PERFORMANCE AND TYPE

English■ PERFORMANCE AND TYPE

The watch is suitable forswimming.

Do not turn or pull out the crown when thewatch is wet.

Water may get inside of the watch.
* If the inner surface of the glass is clouded with condensation or water
droplets appear inside of the watch for a long time, the water resistantperformance of the watch is deteriorated.
Immediately consult the retailer from whom the watch was purchased or
SEIKO CUSTOMER SERVICE CENTER.

Do not leave moisture, sweat and dirt on thewatch for a long time.

Be aware of a risk that a water resistant watch may lessen its water resistantperformance because of deterioration of the adhesive on the glass or
gasket, or the development of rust on stainless steel.

Do not wear the watch while taking a bath ora sauna.

Steam, soap or some components of a hot spring may accelerate thedeterioration of water resistant performance of the watch.

The watch is suitable for diving
not using an air cylinder.

CAUTIONS ON WATER RESISTANCE

5

■ CHARACTERISTICS<Case back side>

5 Power reserve indicator→ P. 13○ This watch features“ Spring drive”, the unique mechanism made available only by SEIKO
technology.
○ The Spring Drive watch ensures quartz accuracy while using the mainspring as its sole
power source.
○ The glide-motion seconds hand moves in a perfectly smooth movement.

5
Englishb CAUTION○ Spring Drive works by the power provided by the mainspring. Remember to check thepower reserve indicator and keep the mainspring of the watch sufficiently wound while
using the watch.
“Power reserve indicator”→ P. 13○ Under a low-temperature condition (below 0 °C), the watch may stop if the watch powershown by the power reserve indicator falls below one-fourth (7R series) or one-sixth (5Rseries, 7R31).
Turn the crown to wind the mainspring.

■ NAMES OF THE PARTS
Please check the caliber number of your watch before reading each operating instruction.
The caliber number can be checked on the case back of your watch. “PERFORMANCE AND
TYPE”→ P. 4
* The caliber number identifies your watch type.
* The orientation and design of the display may vary depending on the model.

7R87

Manual winding type with date setting function

1 Hour hand

4

1

5

<Dial side>

1 Hour hand

3
1

2 Seconds hand2

3

5 Crown→ P. 10
6 Date26

6

3 Minute hand
4 Crown→ P. 10

3 Seconds hand
4 Minute hand

2

7R31

2 Power reserve indicator→ P. 13

How to wind the mainspring (7R series)→ P. 11
How to use (For Cal. 7R87, 7R88)→ P. 16

4

How to wind the mainspring (7R series)→ P. 11
How to use (For Cal. 7R31)→ P. 15

6

CHARACTERISTICSNAMES OF THE PARTS

7

7R88

7R99

Manual winding type with date setting function

1 Hour hand

2 Power reserve indicator→ P. 13
3 Seconds hand1

5 Crown→ P. 10

2

1 Hour hand

4

4 Minute hand25
3

2 Power reserve indicator→ P. 13
3 Seconds hand
4 Minute hand

6 Date55 Crown→ P. 10

English4

1

Manual winding type3

6

6
How to wind the mainspring (7R series)→ P. 11
How to use (For Cal. 7R87, 7R88)→ P. 16

How to wind the mainspring (7R series)→ P. 11
How to use (For Cal. 7R99)→ P. 18

7R89

5R77

Manual winding type with moon phase display function

1 Hour hand

1

4

2 Power reserve indicator→ P. 13
3 Seconds hand

Automatic type (with manual winding function) featuring moon phase display function
1 Hour hand
2 Seconds hand

1

4

4 Minute hand

2
5

6

8

NAMES OF THE PARTS

4 Minute hand

5 Crown→ P. 10

5

6 Moon phase display

5 Crown→ P. 10

6 Moon phase display

2

3

How to wind the mainspring (7R series)→ P. 11
How to use (For Cal. 7R89, 5R77)→ P. 19

3 Power reserve indicator→ P. 13

3

6

How to wind the mainspring (5R series)→ P. 12
How to use (For Cal. 7R89, 5R77)→ P. 19

NAMES OF THE PARTS

9■ HOW TO USE

How to wind the mainspring (7R series)
This watch has a manually wound spring drive.
You can wind the crown to wind the mainspring to drive the watch.

Crown
While
pressing thecrown in, turn itin the direction
indicated by
the arrow.

Normal crown

The
crown
turns.

The crown
does notturn.

Pull out the crown and operate it.
Screw down crown
Unlock the crown
before operating it.

* By locking the crown by screw, ascrew down crown can prevent
malfunction and increase water
resistance.

* Be careful not to screw the crownin by force as it may damage theslots of the crown.
* Turn the crown from time to time. → P. 23

After operating thecrown, lock it.

Unscrew
Rotate whilepressing
the crown in.

Guide for winding state of the mainspring
Manual winding: Seven full rotations of the crown will provide the power to run the watch
for approximately ten hours.

Observe the power reserve indicator to check the level of the remaining power.
“Power reserve indicator”→ P. 13

EnglishThere are two types of crowns, the regular one and one that can be locked.
Please confirm the crown of the watch that you are using.

* Under a low-temperature condition (below 0 °C), always keep at least one-fourth of thewatch power, or one-sixth for 7R31, shown by the power reserve indicator.
The watch may stop if this condition is not met.

How to manually wind the mainspring
1 Turn the crown at the normal position
clockwise (12 o’clock direction)
slowly.
(If the watch is equipped with thescrew down crown, unscrew thecrown before pulling it out.)
2 Wind the mainspring until the power reserve indicator shows a fully wound state.
“Power reserve indicator”→ P. 13
3 Make sure that the seconds hand is moving.
(If the crown of your watch is a screw lock type, lock the crown.)b CAUTION

The crown cannot be turned further when the mainspring is fully wound to prevent
overwinding of the mainspring. Do not try to forcefully turn the crown as this may damage
the watch.

10

HOW TO USE

How to wind the mainspring(7RTO
series)
HOW
USE

11

Power reserve indicator

This watch is an automatic winding type (with manual winding function).
When the watch is worn on the wrist, the motion of the wearer’s arm winds the mainspring tooperate the watch.
You can also manually wind the mainspring by turning the crown.

The power reserve indicator lets you know the winding state of the mainspring.
Before removing the watch from your wrist, observe the power reserve indicator to check if
the watch has stored enough power to keep running until the next time you wear it. If
necessary, wind the mainspring.
(To prevent the watch from stopping, wind the mainspring to store the excess power that willallow the watch to run for extra time.)

Guide for winding state of the mainspring

Automatic winding: The mainspring of the watch becomes fully wound when the watch isworn for twelve hours per day for three to five consecutive days.
Manual winding : Five full rotations of the crown will provide the power to run the watch
for approximately ten hours.

Power reserve
indicator

EnglishHow to wind the mainspring (5R series)

Observe the power reserve indicator to check the level of the remaining power.
“Power reserve indicator”→ P. 13* Under a low-temperature condition (below 0 °C), always keep at least one-sixth of thewatch power shown by the power reserve indicator.
The watch may stop.

How to manually wind the mainspring
1 Turn the crown at the normal position
clockwise (12 o’clock direction)
slowly.
(If the watch is equipped with thescrew down crown, unscrew thecrown before pulling it out.)
2 Wind the mainspring until the power reserve indicator shows a fully wound state.
“Power reserve indicator”→ P. 13

26* The power reserve for automatic winding type watches (5R series) varies depending on
your use conditions (watch wearing, time of use, amount of movement during use, etc.).
* In a case where you wear the watch for a short period of time, observe the power reserve
indicator to check the level of the remaining power. If necessary, manually wind themainspring.

How to read the power reserve indicator

3 Make sure that the seconds hand is moving.
(If the crown of your watch is a screw lock type, lock the crown.)* The crown can be turned further when the mainspring is fully wound.
Turning the crown after the mainspring is fully wound will not damage the watch, however,please refrain from excessive operation because the mainspring cannot be wound any
further.

Power reserve
indicator

Winding state of themainspring
Number of 7R series
hours thewatch can5R seriesrun

12

How toTOwind
the mainspring (5R series)
HOW
USE

Fully wound

Half wound

Approximately
48 hours (2 days)

Approximately
24 hours (1 day)Approximately
72 hours (3 days)

UnwoundApproximately
36 hours (1.5 days)

The watch either
stops or is running
down.

Power reserve
HOW indicator
TO USE

13

<For 7R31>

How to use (For Cal. 7R31)

The power reserve indicator is on the case back of the watch.

How to set the time

2 Pull out the crown when the seconds
hand is at the 12 o’clock position.
(The seconds hand stops.)(If the watch is equipped with thescrew down crown, unscrew thecrown before pulling it out.)

Power reserve
indicator

English

1 Make sure that the watch is operating.
To carry out the procedure, please make sure that the watch is in working state.
Please wind the mainspring when the watch is not working.
“How to wind the mainspring (7R series)”→ P. 11

How to read the power reserve indicator
3 Turn the crown counterclockwise (6o’clock direction) to advance thehands to set the current time.

Power reserve
indicator

Winding state of themainspring

Number of hours thewatch can run

Fully wound

Half wound

UnwoundApproximately 72
hours (3 days)

Approximately 36
hours (1.5 days)

The watch either stops
or is running down.

* The crown cannot be turned further when the mainspring is fully wound to prevent
overwinding of the mainspring. Do not try to forcefully turn the crown as this may damage thewatch.

4 Push the crown back into the normal position in accordance with a time signal.
(If the crown of your watch is a screw lock type, lock the crown.)

Tips for more accurate time setting

To ensure effective operation of the Spring Drive mechanism, observe the following
instructions when you set the time.
1 Before setting the time, make sure to wind the mainspring sufficiently.
(Ensure that the power reserve indicator is showing a fully wound state.)

2 When starting to use a watch after it stops, wind the mainspring sufficiently. To set thetime after that, wait for approximately 30 seconds after the seconds hand starts moving,then pull the crown out to the first click.

3 The seconds hand will stop moving when the crown is pulled out to the first click. Do notstop the movement of the seconds hand for longer than 30 minutes. If the stoppage of theseconds hand movement exceeds 30 minutes, push the crown back in, and wait for
approximately 30 seconds after the seconds hand restarts moving, and then set the time.

14

PowerTO
reserve
HOW
USE indicator

How to use (ForCal.
HOW
TO7R31)USE

15How to use (For Cal. 7R87, 7R88)
b CAUTION

How to set the time and dateThis watch is equipped with the date display function. The date changes once every 24 hours
at around midnight.
Therefore, if the a.m./p.m. is incorrectly set, the date will change around 12:00 p.m.
1 Make sure that the watch is operating.
To carry out the procedure, please make sure that the watch is in working state.
Please wind the mainspring when the watch is not working.
“How to wind the mainspring (7R series)”→ P. 11

2 Pull out the crown to the first click.
(If the watch is equipped with thescrew down crown, unscrew thecrown before pulling it out.)* The watch keeps on operating.
05

3 The date can be adjusted by turning
the crown counterclockwise (6o’clock direction).
First turn the crowncounterclockwise until the previous
day’s date from the desired dateappears.
【Ex.】 If you want to set the dateto “6,” set the date to “5”by turning the crowncounterclockwise.

English○ Do not adjust the date when the time the watch indicates between 9:00 p.m. and 1:00 a.m.
If the date is adjusted in this condition, the date may not change properly the following day,or a malfunction may occur.
○ If you set the date when the time the watch indicates between 9:00 p.m. and 1:00 a.m., pullout the crown to the second click, and turn it counterclockwise (6 o’clock direction) toadvance the hour hand until it passes 1:00 a.m. temporarily, and then set the date.

4 Pull out the crown to the second click
when the seconds hand is at the
12 o’clock position. (The seconds
hand stops.)
Turn the crown counterclockwise(6 o’clock direction) to advance thehands until the desired date appears.
06
If the date changes, it means that thewatch is set in the morning. Turn thecrown further until the watch is set tothe current time.
Set the minute hand about ten
minutes behind and then slowly
advance the minute hand to thedesired time.
5 Push the crown back into the normal position in accordance with a time signal. The watch
starts operating.
(If the crown of your watch is a screw lock type, lock the crown.)

Date adjustment at the end of the month

It is necessary to adjust the date after February (which has 28 days, 29 days in a leap year)
and a 30 day month.

【Ex.】 To adjust the date in the a.m. period on the first day of a month following a 30-daymonth
On the first day, “31” is displayed. Pull out
the crown to the first click. Turn the crowncounterclockwise (6 o’clock direction) to
set the date to “1,” and push the crown backinto the normal position.
01

05

b CAUTION○ Do not adjust the date when the time the watch indicates between
9:00 p.m. and 1:00 a.m. → P. 16○ For models with a screw down crown, remember to screw the crownin.

Tips for more accurate time setting

To ensure effective operation of the Spring Drive mechanism, observe the following
instructions when you set the time.
1 Before setting the time, make sure to wind the mainspring sufficiently.
(Ensure that the power reserve indicator is showing a fully wound state.)

2 When starting to use a watch after it stops, wind the mainspring sufficiently. To set thetime after that, wait for approximately 30 seconds after the seconds hand starts moving,then pull the crown out to the second click.

3 The seconds hand will stop moving when the crown is pulled out to the second click. Do
not stop the movement of the seconds hand for longer than 30 minutes. If the stoppageof the seconds hand movement exceeds 30 minutes, push the crown back in, and wait
for approximately 30 seconds after the seconds hand restarts moving, and then set the
time.

16

How toTO
use(For Cal. 7R87, 7R88)
HOW
USE

How to use (For Cal.HOW
7R87,
TO7R88)USE

17How to use (For Cal. 7R99)

How to use (For Cal. 7R89, 5R77)

How to set the time

When setting the time and moon phase, set the time first and then set the moon phase.

2 Pull out the crown when the seconds
hand is at the 12 o’clock position.
(The seconds hand stops.)(If the watch is equipped with thescrew down crown, unscrew thecrown before pulling it out.)

3 Turn the crown to set the hour andminute hands to the time.
Set the minute hand about ten
minutes behind and then slowly
advance the minute hand to thedesired time.

4 Push the crown back into the normal position in accordance with a time signal.
(If the crown of your watch is a screw lock type, lock the crown.)

Tips for more accurate time setting

To ensure effective operation of the Spring Drive mechanism, observe the following
instructions when you set the time.

How to set the time

1 Make sure that the watch is operating.
To carry out the procedure, please make sure that the watch is in working state.
Please wind the mainspring when the watch is not working.
“How to wind the mainspring (7R series)”→ P. 11“How to wind the mainspring (5R series)”→ P. 12

English

1 Make sure that the watch is operating.
To carry out the procedure, please make sure that the watch is in working state.
Please wind the mainspring when the watch is not working.
“How to wind the mainspring (7R series)”→ P. 11

2 Pull out the crown to the second click
when the seconds hand is at the
12 o’clock position. (The seconds
hand stops.)(If the watch is equipped with thescrew down crown, unscrew thecrown before pulling it out.)

3 Turn the crown counterclockwise(6 o’clock direction) to advance thehands to set the time.
Set the minute hand about ten
minutes behind and then slowly
advance the minute hand to thedesired time.
* It is designed so that the moonphase changes once every
24 hours while the time is shownby a 12-hour display.
4 Push the crown back into the normal position in accordance with a time signal. The watch
starts operating.
(If the crown of your watch is a screw lock type, lock the crown.)

1 Before setting the time, make sure to wind the mainspring sufficiently.
(Ensure that the power reserve indicator is showing a fully wound state.)

2 When starting to use a watch after it stops, wind the mainspring sufficiently. To set thetime after that, wait for approximately 30 seconds after the seconds hand starts moving,then pull the crown out to the first click.

3 The seconds hand will stop moving when the crown is pulled out to the first click. Do notstop the movement of the seconds hand for longer than 30 minutes. If the stoppage of theseconds hand movement exceeds 30 minutes, push the crown back in, and wait for
approximately 30 seconds after the seconds hand restarts moving, and then set the time.

18

How toTO
use(For Cal. 7R99)
HOW
USE

How to use (For Cal.HOW
7R89,
TO5R77)USE

19

How to set the moon phase

This watch is equipped with a moon phase display function.
The shape of the moon on the moon phase display indicates the approximate moon phase.
After setting the time, set the moon phase.
0

Moon phase7

15

3 Turn the crown counterclockwise(6 o’clock direction) to hide the moonon the moon phase display.

22

New moon
Ex.1
Moon phasedisplay

Quarter moon

Full moon

Waning moon

moon

moon

Ex.2

* The moon phase display shows the phases (waxing and waning) of the moon. The moonphase represents the period from the time when the last new moon (moon phase: 0.0)
occurred to noon of the current day in day increments. The average length of the period
between new moons is approximately 29.5 days.
* The shape of the moon on the moon phase display shows the moon phase, and does notshow the shape of the moon itself.

b CAUTION○ Do not adjust the moon phase when the time the watch indicates between 9:00 and 2:00.
Amending the moon phase during this time period may cause damage.
○ If the watch hands show any time between 9:00 and 2:00, pull out the crown to the second
click, and turn it counterclockwise (6 o’clock direction) to temporarily advance the time
past 2:00.
Adjust the time to the correct time after setting the moon phase.

1 Check the current moon phase.
* Check the current moon phase from the weather and moon phase data page in yourlocal newspaper.

EnglishWhole moon is hidden(the state of “Moon phase 0 (newmoon)”)The name of moon phase
4 Turn the crown counterclockwise(6 o’clock direction) to advance themoon phase by one until the correct
moon phase is displayed.
Round off the number of the moonphase to the first decimal place.
【Ex.】 If the current moon phaseis 14.8, set the moonphase to“ moon phase
15.”

Moon
phase 0Moon
phase 15

5 Push the crown back in to the normal position.
(If the crown of your watch is a screw lock type, lock the crown.)

Tips for more accurate time setting

To ensure effective operation of the Spring Drive mechanism, observe the following
instructions when you set the time.
1 Before setting the time, make sure to wind the mainspring sufficiently.
(Ensure that the power reserve indicator is showing a fully wound state.)

2 When starting to use a watch after it stops, wind the mainspring sufficiently. To set thetime after that, wait for approximately 30 seconds after the seconds hand starts moving,then pull the crown out to the second click.

3 The seconds hand will stop moving when the crown is pulled out to the second click. Do
not stop the movement of the seconds hand for longer than 30 minutes. If the stoppageof the seconds hand movement exceeds 30 minutes, push the crown back in, and wait
for approximately 30 seconds after the seconds hand restarts moving, and then set thetime.

2 Pull out the crown to the first click.
(If the watch is equipped with thescrew down crown, unscrew thecrown before pulling it out.)

20

How toTO
use(For Cal. 7R89, 5R77)
HOW
USE

How to use (For Cal.HOW
7R89,
TO5R77)USE

21

■ TO PRESERVE THE QUALITY OF YOUR
WATCH
Notes on guarantee and repair○ Contact the retailer from whom the watch was purchased or SEIKO CUSTOMER SERVICECENTER for repair or overhaul.
○ Within the guarantee period, present the certificate of guarantee to receive repair services.
○ Guarantee coverage is provided in the certificate of guarantee. Read carefully and retainit.
○ For repair services after the guarantee period has expired, if the functions of the watch canbe restored by repair work, we will undertake repair services upon request and payment.

Replacement parts○ Please keep in mind that if original parts are not available, they may be replaced with
substitutes whose outward appearance may differ from the originals.

Inspection and adjustment by disassembly andcleaning (overhaul)○ Periodic inspection and adjustment by disassembly and cleaning (overhaul) is
recommended approximately once every 3 to 4 years in order to maintain optimal
performance of the watch for a long time.
○ The movement of this watch has a structure that consistent pressure is applied on its powertransmitting wheels. To ensure these parts work together properly, periodic inspection
including cleaning of parts and movement, oiling, adjustment of accuracy, functional checkand replacement of worn parts is needed. Inspection and adjustment by disassembly andcleaning (overhaul) within 3 to 4 years from the date of purchase is highly recommended
for longtime use of your watch. According to use conditions, the oil retaining condition ofyour watch mechanical parts may deteriorate, abrasion of the parts may occur due tocontamination of oil, which may ultimately lead the watch to stop.
As the parts such as the gasket may deteriorate, water-resistant performance may be
impaired due to intrusion of perspiration and moisture.
Please contact the retailer from whom the watch was purchased for inspection andadjustment by disassembly and cleaning (overhaul). For replacement of parts, please
specify “SEIKO GENUINE PARTS”. When asking for inspection and adjustment by
disassembly and cleaning (overhaul), make sure that the gasket and push pin are also
replaced with new ones.
○ When your watch is inspected and adjusted by disassembly and cleaning (overhauled),
the movement of your watch may be replaced.

The watch requires good daily care

○ The watch body and band touch the skin directly just as underwear.
Keep the watch body and band clean in order to avoid stain on the sleeve edge or rash or
itch.
After removing the watch from your wrist, wipe perspiration or moisture with a soft cloth assoon as possible.
○ Do not use any chemical agent such as cleaner to clean the watch.

Turn the crown from time to time. (Only several turns inslow movement will be enough.)EnglishAfter-sale service

Daily care

○ This prevents corrosion of the crown and helps to extend the life of the gasket in use.
○ The same practice should be applied to a screw down crown. (No need to pull out the screw
down crown.)“Crown”→ P. 10○ Stainless steel is a highly rust-resistant metal. However, rust will form if contaminants areleft on it for a long time.

Remarks on 18-karat gold
○ 18-karat gold (18KT) is an alloy comprised of 75% of gold and 25% of other metals.
Depending on the proportion of the other metals mixed with the gold, the 18-karat gold isclassified into three colors such as yellow gold (YG), white gold (WG) and pink gold (PG).

Decoloration of 18-karat gold

○ While gold can maintain its glittering quality, other metal components in the alloy may
discolor to look like reddish or blackish due to various reasons.
○ Daily care helps to prevent discoloration of the alloy, however, if the discoloration or stainof the alloy persists even after wiping the watch off, take your watch to the retailer fromwhom the watch was purchased for refinishing. (Refinishing will be done at a cost.)

Watch body / metal bracelet

Length adjustment service○ For the length adjustment service of the 18-karat gold or platinum bracelet, ask the retailer
from whom the watch was purchased.
The watch will be submitted to CREDOR SERVICE STUDIO for the length adjustment.
It may take two to three weeks depending on the model to adjust the length of the bracelet.
○ The length adjustment service of the 18-karat gold, platinum or stainless steel mesh bracelet
will not be charged only for the first time. However, the cost for materials or parts necessary
for the length adjustment and repair cost other than the length adjustment will be charged.
○ The length adjustment service of stainless-steel band is available from the retailer fromwhom the watch was purchased or SEIKO CUSTOMER SERVICE CENTER. Some otherretailers may charge you for the length adjustment or may not undertake such treatments.

Periodic cleaning○ Periodic cleaning is highly recommended to enjoy the best quality of the watch for a longtime.
Ask the retailer from whom the watch was purchased or the CREDOR SERVICE STUDIO
through your nearby CREDOR retailers. (Cleaning may be done at a cost.)

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TO PRESERVE THE QUALITY OF YOUR WATCH

TO PRESERVE THE QUALITY OF YOUR WATCH

23

Band
The band touches the skin directly and becomes dirty from sweat or dust. Therefore,lack of care may accelerate deterioration of the band or cause skin irritation or stain
on the sleeve edge. The watch requires a lot of attention for long usage.

How to use an adjustable three-fold clasp

Adjustable three-fold clasp○ Moisture, sweat or soil will cause rust even on a stainless steel band if they are left for along time.
○ Lack of care may cause a yellowish or gold stain on the lower sleeve edge of shirts.
○ Wipe off moisture, sweat or soil with a soft cloth as soon as possible.
○ To clean the soil around the joint gaps of the band, wipe it out in water and then brush it off
with a soft toothbrush. (Protect the watch body from water splashes by wrapping it up in
plastic wrap etc.)
Wipe off the remaining moisture with a soft cloth.
○ Because some titanium bracelets use pins made of stainless steel, which has outstanding
strength, rust may form in the stainless steel parts.
○ If rust advances, pins may poke out or drop out, and the watch case may fall off the bracelet,or the clasp may not open.
○ If a pin is poking out, personal injury may result. In such a case, refrain from using the watch
and request repair.

Leather band

○ A leather band is susceptible to discoloration and deterioration from moisture, sweat anddirect sunlight.
○ Wipe off moisture and sweat as soon as possible by gently blotting them up with a dry cloth.
○ Do not expose the watch to direct sunlight for a long time.
○ Please take care when wearing a watch with light-colored band, as dirt is likely to show up.
○ Refrain from wearing a leather band watch other than Aqua Free bands while swimming,
and when working with water even if the watch itself is water-resistant enforced for dailyuse.

How to adjust the length of the band
1 Thread the tip of the band to the buckle.
Buckle2 Slide the band to adjust its length and findthe appropriate hole. Place the pin into the
hole.

Tip

Pin

Adjustinghole

How to wear the watch

Insert the tip of the band into the fixed loop andmovable loop, and push the buckle down tofasten the clasp.

Fixed loop
BuckleMovable loop

Polyurethane band

○ A polyurethane band is susceptible to discoloration from light, and may be deteriorated bysolvent or atmospheric humidity.
○ Especially a translucent, white, or pale colored band easily adsorbs other colors, resulting
in color smears or discoloration.
○ Wash out dirt in water and clean it off with a dry cloth.
(Protect the watch body from water splashes by wrapping it up in plastic wrap etc.)○ When the band becomes less flexible, have the band replaced with a new one. If you
continue to use the band as it is, the band may develop cracks or become brittle over time.

EnglishMetallic band

Tip

How to take off the watch

Place your finger between the band and clasp. Pinch the band with your fingers and pull it
forward to open the clasp.
* Do not pull the tip of the band to open the clasp, as this may damage the band.
BuckleNotes on skin irritation and allergy

Skin irritation caused by a band has various reasons such as allergy to metals or leathers, orskin reactions against friction on dust or the band itself.

Notes on the length of the band

Adjust the band to allow a little clearance with your wrist to ensure proper airflow.
When wearing the watch, leave enough room to insert a finger between the bandand your wrist.

24

TO PRESERVE THE QUALITY OF YOUR WATCH* If it is difficult to open the band following the above procedure, hold both sides of the buckle
to open the clasp.

TO PRESERVE THE QUALITY OF YOUR WATCH

25

Magnetic resistance (Magnetic influence)

Lumibrite

Affected by nearby magnetism, a watch may temporarily gain or lose time or stop operating.
This watch is a magnetic resistant watch that is fully compliant with JIS level-1 standard.
Conditions of use(JIS-1)

If the watch becomes magnetized and its accuracy deteriorates to an extent exceeding the specified
rate under normal use, the watch may need to be demagnetized. In this case, you will be charged
for demagnetization and accuracy readjustment even if it happens within the guarantee period.

Examples of common magnetic products that may affect watches

Lumibrite is a luminous paint that absorbs light energy of the sunlight and lighting apparatus in a shorttime and stores it to emit light in the dark. For example, if exposed to a light of more than 500 lux forapproximately 10 minutes, Lumibrite can emit light for 3 to 5 hours. Please note, however, Lumibriteemits the light it stores, the luminance level of the light decreases gradually over time. The duration of
the emitted light may also differ slightly depending on such factors as the brightness of the place where
the watch is exposed to light and the distance from the light source to the watch.
* In general, when you enter a dark place from a bright environment, your eye cannot adapt to thechange in light levels quickly. At first, you can hardly see anything, but as time passes, your vision
gradually improves. (Dark adaptation of the human eye)
* Lumibrite is a luminous paint that is completely harmless to human beings and the naturalenvironment; containing no noxious materials such as radioactive substance.

Reference data on the luminance
Condition

Sunlight

Smartphone, cellular phone, tablet terminal(speaker, magnet of cover)

AC-powered
shaverMagnetic
cooking device

Portable radio(speaker)AC adapter

Magnetic
necklace

Bag(with magnet
buckle)Indoor (Window-side
during daytime)
Lighting apparatus(40-watt daylightfluorescent light)

Illumination

Fine weather

100,000 lux

Fine weather

more than 3,000 lux

Rainy weather

less than 1,000 lux

Cloudy weather
Cloudy weather
Distance to the watch: 1 m
Distance to the watch: 3 m
Distance to the watch: 4 m

EnglishKeep the watch more than 5 cm away from magnetic products.

If your watch has Lumibrite

10,000 lux

1,000 to 3,000 lux

1,000 lux

500 lux (average room luminance)
250 lux

Magnetic healthpillow

The reason why this watch is affected by magnetism

The built-in speed-regulating mechanism is provided with a magnet, which may be influenced bya strong external magnetic field.

26

TO PRESERVE THE QUALITY OF YOUR WATCH

TO PRESERVE THE QUALITY OF YOUR WATCH

27

Troubleshooting
TroublesTroublesPossible causes

Solutions

Turn the crown to wind the mainspring.
Under a low-temperature condition
The watch has been left at a (below 0 °C), the watch may stop if the
The watch stops evenwatch power shown by the powerthough the power reserve
low temperature (below
reserve indicator falls below one-fourth
indicator is not showing “0”. 0°C).
(7R series) or one-sixth (5R series,
7R31).

Return the watch to a normal
temperature so that it works accurately
The watch has been left in as usual, and then reset the time. The
extremely high or low
watch has been adjusted so that it
temperatures for a long time. works accurately when it is worn on
your wrist under a normal temperature
range between 5°C and 35°C.

It takes the time to change
the date.
(7R87, 7R88)
Right after starting thewatch, it seems that theseconds hand moves more
quickly than usual whensetting the time.
Blur in the display persists.

Solutions

It takes several seconds before theWhen the watch starts
speed-regulating unit starts operating.
moving, it takes a little time
To set the time correctly, wait for
before the speed-regulating
approximately 30 seconds after theunit starts operating. (This isseconds hand starts to move, and set
not a malfunction.)
the time.
Small amount of water has
got inside the watch due todeterioration of the gasket,
etc.

EnglishTurn the crown to wind the mainspring
and reset the time. While you are
The mainspring has not been wearing the watch or when you take it
The watch stops operating.
off, check the remaining power shownwound.
by the power reserve indicator andwind the mainspring if necessary.

Possible causesThis is not a malfunction.
(It is designed that the datechange mechanism works No operation is needed.
between 9:00 p.m. and 1:00
a.m.)Consult the retailer from whom thewatch was purchased.

* For the solution of troubles other than above, contact the retailer from whom the watch waspurchased.

Correct this condition by moving andkeeping the watch away from the
The watch temporarily loses/
The watch was brought into
magnetic source, and reset the time. If
gains time.
close contact with athis action does not correct themagnetic object.
condition, contact the retailer fromwhom the watch was purchased.
The watch was dropped,
worn while playing active
sports, hit against hardsurfaces, or exposed tostrong vibrations.

The date changes during
daytime.
(7R87, 7R88)

The watch hands movequicker than usual.

A.m./p.m. is not correctly set.

This is not a malfunction.

Reset the time. If the watch does not
return to its normal accuracy after
resetting the time, contact the retailer
from whom the watch was purchased.
When you set the time, note that the
moment the date changes is midnight.
When setting the hour hand, be surethat a.m./p.m. is correctly set.
1. Conduct the following crownoperation.
(7R87, 7R88, 7R89, 5R77) Normal
position → Second click → Normal
position(7R31, 7R99) Normal position →First click → Normal position
2. Reset the time.

Even though you wear thewatch every day, the power
reserve indicator does not
move up.
(5R series)

28

The watch is worn on your
Wear the watch for an extended period
wrist only for a short period ofof time. Or turn the crown to wind thetime, or the amount of arm
mainspring.
movement is small.

TO PRESERVE THE QUALITY OF YOUR WATCH

TO PRESERVE THE QUALITY OF YOUR WATCH

29

■ SPECIFICATIONS (Movement)
Cal. NO

7R87
7R88

FeaturesHour hand, minute hand,seconds hand, date,
power reserve indicator

Frequency of
crystal oscillator
Loss/Gain

7R89

7R99

Hour hand, minute hand,seconds hand, moonphase display, power
reserve indicator

Hour hand, minute hand,seconds hand, power
reserve indicator

32,768 Hz (Hz = Cycles per second)
Within 15 seconds per month (equivalent to 1 second per day)(If the watch is worn on your wrist within normal temperature range between 5 °C
and 35 °C.)

-10°C ~ +60°C
Operational
Under a low-temperature condition (below 0 °C), always keep at least one-fourth oftemperature range
the watch power shown by the power reserve indicator.
Driving system

Manual winding type

DurationIC (Integrated
Circuit)Approximately 48 hours*1
Oscillator, frequency divider, and spring drive control circuit (C-MOS-IC): 1 piece

Hand movement
JewelsCal. NO
Features
Frequency of
crystal oscillator
Loss/Gain

30 jewels

Glide motion

32 jewels

5R77

7R31

Hour hand, minute hand, seconds hand,Hour hand, minute hand, seconds hand,moon phase display, power reserve
power reserve indicator
indicator
32,768 Hz (Hz = Cycles per second)
Within 15 seconds per month (equivalent to 1 second per day)(If the watch is worn on your wrist within normal temperature range between 5 °C
and 35 °C.)

-10°C ~ +60°C
Operational
Under a low-temperature condition (below 0 °C), always keep at least one-sixth oftemperature range
the watch power shown by the power reserve indicator.
Driving system
Duration

Automatic winding type (with manual
winding function)

Manual winding type

Approximately 72 hours*1

IC (Integrated
Circuit)

Oscillator, frequency divider, and spring drive control circuit (C-MOS-IC): 1 piece

Jewels

30 jewels

Hand movement

Glide motion*1 When the power reserve indicator shows a fully wound state, duration may be shortened
depending on the how the product is used.
* The specifications are subject to change without prior notice due to product improvement.

30

SPECIFICATIONS (Movement)