Ancient Seiko digital watch

Question moved from Lands Phones category.

SEIKO - A158 5040

Digital Watch Library http://www.digitalwatchlibrary.com > DWL > seiko-a1...

SEIKO - A158 5040 - Digital. Released in 1978 Vintage Digital Watch - Brought to you courtesy of digital-watch.com.

SEIKO QUARTZ Cal. A159 Alarm Chronograph

My Retro Watches https://myretrowatches.co.uk > uploads > 2020/09
The A158 Alarm Chronograph model can be set to give a time signal ... QUARTZ. ALARM-CHRONOGRAPH. START/STOP. DATE/SELECT. STOP-ALARM. WATCH SET TIME SET LAP STOP ...
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Missing: 5040A ‎' Show results with: 5040A

Instruction ' Seiko Watch Corporation

SEIKO WATCH https://www.seikowatches.com > customerservice > ins...
Seiko is one of the few fully integrated watch manufactures. We design and develop our own movements using leading-edge technology.

did it come with a manual? you can use the manual to set it up.

Go here and follow the instruction to get your owner's guide,
http://www.seikowatches.com/support/ib/index.html
You need numbers of the movement from the back of the watch.

Hold in the top two buttons simultaneously until it changes.

With our 10 year old grandson's help, my husband was able to figure it out. Took a while, but he is now wearing his watch again!
Thanks for the follow-up.

Setting the alarm:

1. Pull the crown to the 2nd "click" (the possition you adjust the time) (Carefull: The seconds hand has to be on "12")
2. Press repeatedly button "B" to set ALARM hands to the time indicated by the main time hands (The ALARM hands move quickly if button B is kept pressed)
3. Push the crown to normal possition
4. Pull the crown to the 1st "click".
5. Press repeatedly button "B" to set the desired alarm time. (The ALARM hands move quickly if button B is kept pressed)
6. Push back the crown in to normal position.

At the designated time the alarm rings for 20 seconds, and it is automatically disengaged as it stops. To stop it manually, press button A or B.

Possibly you can change it back by pushing the hour-setting button through a 24 hour cycle--you can see if you are on military time during the PM part of setting it. If it's on military, just keep pushing till you start over at 12 am again (hint: that's 0:00 in military.) At least, that's how it is on my watch.

Mike 1935 if your watch has hands only & no digital display the crown where you set the watch pulls out half a click to set the date and should pull out a little further to set the time try that.

bjbc I am assuming your seiko watch is a digital watch. Try holding in the top rt button if its the watch I think it is it should change to 12yr time.

If its the watch I think it is try holding in the top right button on the watch. That should change it back to 12 hour time

I have a G Shock DW-004 made in 1997. I had this same problem, and I tried everything to change TO military time and back to standard time. I just read the bit to try and was about to do it. I pressed the top left button to get the time to flash, and hit the light button by accident (the one with the big G on it) and VIOLA! It changed to military time. So in my model, anyway, the G light button (under the display on the edge of the watch body) changed the time to military from standard and back again, when the time is flashing.

Good luck!