How can I reset my watch to its factory setting?

Of every watch in the world?

Google
Make model manual

We can't guess. Play with the buttons. One does the time, one stops and starts chrono, one does split times and one resets.

You can even Google

3 button watch instructions
or
4 button watch instructions

Cheap ones are all made in the same factory in China, better ones are made in the same factory in Japan

Look at this site:
https://www.citizenwatch.com/us/en/setting-instructions.html

[PDF]The Apple Watch User Guide (PDF)

https://manuals.info.apple.com/.../apple_watch_user_guide.pd...

Apple Inc.If you have difficulty seeing the Apple Watch or iPhone screen to set it up, .... Note: If you disable your passcode, you can't use Apple Pay on Apple Watch. ..... Alarm • Timer • Stopwatch • Battery charge • World Clock • Your monogram (displays ...

[PDF]Cal. 7T62 - Seiko

www.seikowatches.com/support/ib/pdf/SEIKO_7T62.pdf

SeikoYou are now the proud owner of a SEIKO Analogue Quartz Watch Cal. .... into consideration the time required to set the ALARM hands and to adjust the .... The single-time alarm cannot be set for a time more than 12 hours ahead of the current ...

How to Set an Alarm on the Apple Watch - YouTube

this link is the manual
http://www.polar.com/e_manuals/RS300X/Polar_RS300X_user_manual_English.pdf

Hi,

The display of your watch may "freeze" due to static electricity or recent battery replacement.

If this occurs, press and hold all four buttons at the same time.

This will erase the data in the memory and allow you to reset the watch to the factory settings.

Press and hold all four side buttons at the same time to reset the watch to the factory settings.

Hope this helps.

Hi, According to your problem first make sure that the battery that you have changed is OK, or try another battery. Your watch need a factory reset. If normal factory reseting doesn't solve your problem then you have to repair the machine.

Indeed. Here's what to do:
Press and hold all the buttons together eg. Light, Mode, Sel and Set (prob best to take off your wrist at this point), and hold for approx 1 second. The watch will give a shrill beep!
The watch face looks like its gone back to factory reset, but stick with it. Scroll through the mode and you will see the date and month (and all other settings) are stored from previous time. Just advance the time using the Select button and voila!

http://www.polarusa.com/us-en/support/product_support?product=276&category=Downloads&documenttitle=%0AUser+Manual+for+F6+in+English+9%2F2005-&document=/gip/PEUS1kb-public.nsf/web_cat/85256F470048B0BC852574730060F73F?openDocument

copy and paste this link in your address bar. It is your entire manual with reset instrucions

You need to "Reset" the watch's computer, this is done by removing the case cap, (Same as battery replacement) Look for a imbosed "RESET" and using a paperclip, Push gently in the reset hole for five seconds, Remove the paperclip, You should then have all funtions restored to "Factory Settings"

Use this page to download a copy of CASIO watch manuals in PDF format. To download a PDF file, enter the four-digit (or three-digit) module number marked on the back cover of your watch.

http://world.casio.com/wat/download/en/manual/

You will need a pdf reader on your pc, you will find all instructions in there.

If you don't have a pdf reader you can get one from
http://www.foxitsoftware.com/pdf/rd_intro.php