663917
12
Zoom out
Zoom in
Previous page
1/12
Next page
English
23
English
22
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, and 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 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 a strong magnetism from outside, the 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.
SPECIFICATIONS
1 Features
Cal. 6R20, 6R21, 6R24 ................................. 6 hands, time display (Hour, minute and second
hands), day and date display, power reserve
indicator
Cal. 6R27 ...................................................... 5 hands, time display (Hour, minute and second
hands), date display, power reserve indicator
2 Vibrations per hour .............................................. 28,800
3 Loss/gain (daily rate) ........................................... +25 – 15 seconds at normal temperature range
(between 5°C and 35°C)
4 Continuous operating time ................................ More than approx. 45 hours
5 Driving system .................................................... Automatic winding type with manual winding
mechanism
6 Jewels
Cal. 6R20, 6R21, 6R27 ................................. 29 jewels
Cal. 6R24 ...................................................... 31 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 dur-
ing which the watch is worn on the wrist, temperature, arm movement, and whether the mainspring
is wound up fully or not, etc.
12


Need help? Post your question in this forum.

Forumrules


Report abuse

Libble takes abuse of its services very seriously. We're committed to dealing with such abuse according to the laws in your country of residence. When you submit a report, we'll investigate it and take the appropriate action. We'll get back to you only if we require additional details or have more information to share.

Product:

For example, Anti-Semitic content, racist content, or material that could result in a violent physical act.

For example, a credit card number, a personal identification number, or an unlisted home address. Note that email addresses and full names are not considered private information.

Forumrules

To achieve meaningful questions, we apply the following rules:

Register

Register getting emails for Seiko 6R21 at:


You will receive an email to register for one or both of the options.


Get your user manual by e-mail

Enter your email address to receive the manual of Seiko 6R21 in the language / languages: English as an attachment in your email.

The manual is 0,49 mb in size.

 

You will receive the manual in your email within minutes. If you have not received an email, then probably have entered the wrong email address or your mailbox is too full. In addition, it may be that your ISP may have a maximum size for emails to receive.

Others manual(s) of Seiko 6R21

Seiko 6R21 User Manual - German - 11 pages

Seiko 6R21 User Manual - Dutch, Dutch - 13 pages


The manual is sent by email. Check your email

If you have not received an email with the manual within fifteen minutes, it may be that you have a entered a wrong email address or that your ISP has set a maximum size to receive email that is smaller than the size of the manual.

The email address you have provided is not correct.

Please check the email address and correct it.

Your question is posted on this page

Would you like to receive an email when new answers and questions are posted? Please enter your email address.



Info