ACCURACY OF MECHANICAL WATCHES
● The accurac y of mechanical watch es is indicate d by the dail y rates of one week
or so.
● The accuracy of mechanical watches may not fall w ithin the specified range of
time accuracy because of loss/gain changes due to the conditions of use, such as
the length of time during whi ch the watch is worn on the wris t, arm movement ,
whether the ma inspr ing is wound up fully or not, etc.
● The key component s in mechanical watches are made of metals which expand
or contr act depending on temperatures due to metal prop erties. This exert s an
eff ect on the accuracy of the watches. Me chani cal watches tend to lose time at
high temperatures w hile they tend to g ain time a t low temperatures .
● In or der to improve accuracy, it is impor tant to regularly suppl y en ergy to the
balance that controls the speed of the gears. The driving forc e of the mainspring
that powers mechanic al watches varies between when it is fully wound and
immediately before it is unwound . As the mains pring unwinds, the forc e
weakens.
Relatively steady a ccur acy can be obtained by wearing the watch on the wrist
frequ ently for the self-winding t ype and winding up the main spring fully everyday
at a fixed time to move it regularly for the wind-up mechanical t ype .
● When affe cted by exter nal strong magnetism, a mechanic al watch may loss/ gain
time temporarily. The parts of the watch may become magnetized depending on
the exten t of the effect. In such a case, consult the retailer from whom the watch
was purchased sinc e the watch requires repair, including demag netizing.
SPECIFICATIONS
1 Features
4R35............................................................. 3 hands, time display (Hour, minute and second hands),
and date display
4R36............................................................. 3 hands, time display (Hour, minute and second hands),
day and date display
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 .................................................... Aut oma tic wi ndi ng t ype wi th m anu al wind ing
mechanism
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.