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○ Mainspring wound condition and accuracy
In order to improve accuracy, it is important to regularly supply energy to the balance that controls the speed
of the gears. The driving force of the mainspring that powers mechanical watches varies between when
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fully wound and immediately before it is unwound. As the mainspring unwinds, the force weakens.
Relatively steady accuracy can be obtained by wearing the watch on the wrist frequently for the self-winding
type and winding up the mainspring fully everyday at a fixed time to move it regularly for the wind-up
mechanical type.
○ Effect of magnetism
When affected by a strong magnetism from outside, the mechanical watch may lose/gain time. The parts
of the watch may become magnetized depending on the extent of the effect.
In such a case, consult the retailer from whom the watch was purchased since the watch requires repair
including demagnetizing.
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Troubles
Possible causes
The date changes at
AM/PM is not properly set.
12 o'clock noon.
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Blur in the display
A small amount of water has got inside the
persists.
watch due to deterioration of the gasket, etc.
* For a solution to a problem other than listed above, contact the retailer from whom the watch was purchased.
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Solutions
Advance the hands by 12 hours.
Consult the retailer from whom the watch was
purchased.
Troubleshooting
Troubles
Possible causes
The watch stops
The mainspring has not been wound.
operating.
The watch has been left in extremely high or
low temperatures for a long time.
The watch gains/loses
The watch has been left close to an object
time.
with a strong magnetic field.
You drop the watch, hit it against a hard
surface, or wear it while playing active sports.
The watch is exposed to strong vibrations.
The watch has not been overhauled for more
than 3 years.
Specifications
Cal.
6R51
1. Features
3 hands (hour, minute,
second)
2. Vibrations per hour
21,600 vibrations/hour (6 vibrations/sec)
3. Loss/gain (daily rate)
+25 to -15 seconds at normal temperature range
Only if worn on the wrist in a temperature range of 5°C to 35°C
4. Driving system
Automatic winding type with manual winding mechanism
5. Duration
6. Jewels
* The accuracy above is factory-adjusted.
* Due to the characteristics of mechanical watches, any actual daily rate may not fall within the range of time accuracy
specified above dependent on the conditions of use, such as the length of time during which the watch is worn on
the wrist, temperature, arm movement, and whether the mainspring is wound up fully or not, etc.
Solutions
Wind up the watch as per "How to wind the
mainspring" → (P.13), and set the time. If the
watch still does not operate, consult the
retailer from whom the watch was purchased.
Return the watch to a normal temperature so
that it works accurately as usual, and then
reset the time. The watch has been adjusted
so that it works accurately when it is worn on
your wrist under a normal temperature range
between 5°C and 35°C.
Accuracy cannot be recovered. Restoring the
original accuracy requires demagnetization
(repair). Consult the retailer from whom the
watch was purchased.
If accuracy does not return after setting the
time, consult the retailer from whom the watch
was purchased.
Consult the retailer from whom the watch was
purchased.
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6R55
6R5H / 6R5J
3 hands (hour, minute,
3 hands (hour, minute,
second), date display
second), 24-hour hand
Approx. 72 hours
24 jewels
EN
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