Accuracy Of Mechanical Watches; Specifications - Seiko 4R36 Instructions Manual

ACCURACY OF MECHANICAL WATCHES

The accuracy of mechanical watches is indicated by the daily rates of one week
●
or so.
The accuracy of mechanical watches may not fall within the specified range of
●
time accuracy because of loss/gain changes due to the conditions of use, such as
the length of time during which the watch is worn on the wrist, arm movement,
whether the mainspring is wound up fully or not, etc.
The key components in mechanical watches are made of metals which expand
●
or contract depending on temperatures due to metal properties. This exerts an
effect on the accuracy of the watches. Mechanical watches tend to lose time at
high temperatures while they tend to gain time at low temperatures.
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 it is fully wound and
immediately before it is unwound.
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.
When affected by external strong magnetism, a mechanical watch may loss/gain
●
time temporarily. 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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As the mainspring unwinds, the force

SPECIFICATIONS

1 Features
4R35............................................................. 3 hands, time display (Hour, minute and second hands),
4R36............................................................. 3 hands, time display (Hour, minute and second hands),
2 Vibrations per hour . ............................................. 21,600
3 Operational temperature range . .......................... Between -10 ºC and 60 ºC (Between 14 ºF and 140 ºF)
4 Continuous operating time ................................ More than approx. 41 hours
5 Driving system . ................................................... Automatic winding type with manual winding
6 Jewels
4R35............................................................. 23 jewels
4R36............................................................. 24 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.
and date display
day and date display
mechanism
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