Accuracy Of Mechanical Watches; Specifications - Seiko PROSPEX 1965 DIVER Bedienungsanleitung

ACCURACY OF MECHANICAL WATCHES

The accuracy of mechanical watches is indicated by the daily rates of one week or so.
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The accuracy of mechanical watches may not fall within the specified range
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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
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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
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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. 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.
When affected by external strong magnetism, a mechanical watch may loss/
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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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SPECIFICATIONS

1 Features ............................................................ 3 hands, time display (Hour, minute and second
2 Vibrations per hour............................................. 21,600
3 Operational temperature range ........................ Between -10 ºC and 60 ºC (Between 14 ºF and 140 ºF)
4 Loss/gain (daily rate) ......................................... +25 – 15 seconds at normal temperature range
5 Continuous operating time ............................... More than approx. 50 hours
6 Driving system ................................................... Automatic winding type with manual winding
7 Magnetic resistance .......................................... 4,800 A/m (60 gauss)
8 Water resistance ................................................ Water resistant up to 200 meters
9 Jewels ................................................................ 23 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.
hands) and date display
(between 5°C and 35°C)
mechanism
The watch is suitable for scuba diving.
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