Introduction for new visitors


Thank you for your purchase of this Citizen watch.

Main articles of web pages for “ Cal. No. W510” are introduced here.

Read “How to use”, “Precautions”, “Maintenance” and other articles and use the watch appropriately.

Cal. No. W510”

It is the home of explanation pages for this watch.
You can access the four main articles below and other articles from this page.
How to use
After-sales service
It is convenient for reference to bookmark this page on the web browser you use.


You can browse main features of this watch picked up from “How to use” on this page.
You ca use the page as a list of shortcuts to certain functions.

” “ Refine your search”

All the title of items of the main articles, “How to use”, “Precautions”, “Troubleshooting” and “After-sales service”, are listed on this page.
You can refine your search by entering a search word included in titles

“How to use”

This article explains how to use this watch topic by topic.
Start reading from the top when you read this for the first time.
You can read topics in sequential order by using “Next” in the bottom of each page.


This article explains things to take care of for using this watch topic by topic.
Tips for long and comfortable use of this watch are gathered together here.
It is recommended to read through the article at least once.
Each topic is categorized under some titles such as “Before using this watch”.


This article explains remedies for troubles which occurs while using the watch.
If you have already known how to use this watch and have an actual trouble, it might be better to look at this article at first.

“After-sales service”

This article shows topics of methods of maintenance of this watch, warranty and supplies.

“ⓘ”, “ⓘ Notice”

Notices about this watch from Citizen are posted here.

“Extra info”

General articles about watches such as about technologies used for them and technical terms for them are gathered here.
The articles are not necessary for using this watch at all but perhaps make using of it a little more interesting.
Visit when you have time.