What is the number 381 on the back of my watch mean

Y148 is the quartz movement model, 8009 is the case number.
The 491300 is the serial number, which means that the watch was produced in January of either 1994, 2004, or 2014. I have no idea what the A1 in a box is for. I hope this helps.

On the back are the specific "case" number. The numbers on the dial below the 6 o-clock position are the "model" number.

Hi it is for recording telephone numbers into the memory..and .. 30 page means 30 different data entry capable.. just in case ,if you need to download a soft version of the user manual pls visit the URL below..

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CASIO Watch User Manual Archives http://world.casio.com/wat/download/en/manual/
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.

Automatic watches will generally run for 2-3 days before they stop.

I have no idea what causes the other problems.

If you want to keep it going while you are not wearing it, you can buy a watch winder, which gives it enough movement to operate the self winding mechanism.

mcdevito75 here, I think you mean the movement number, that is on the movement itself. You"ll have to remove the back cover of the watch and you"ll also need a magnifier glass to vieew this number which tells everything about your watch.

"AM3!!!! is the model number.

There may be three number on the back of a watch.
1) The case number.
2) the movement number.
3) the serial number for the case +watch assembly.

The information on the back of a watch can mean two things: the model of the watch and its serial number.

What is meant rather depends upon the manufacturer.

Many watches are listed by model name for a range but there may be individual types within the range which are referred to by a number.

In some cases the instructions are listed by number and not name.

you can refer to the customer service on the Steinhausen homepage:
http://www.steinhausenonline.com or call free: 24/7(800)208-2607. they can offer you the best advice.

i both a watch its unlisted by kenneth cole, i like to lear to set the alarm