Seiko automatic dive watch that keeps stopping & starting has done it from new,took it to a jewellers and they were afraid to touch it.The watch will go I put it on to wear it and it will stop,if you tap it sometimes it will start again.

Unfortunately, the Seiko website does not have a serial number lookup, so you'll have to identify the model. The "8123-7190" is what Seiko calls the "caliber code." Entering that on the page linked below will narrow down the model number list for you. Clicking on the link for your model will give you the instructions in PDF format. The instructions for your model tell you what size battery to use. For example, the manual for the 8F32 states on page 11 that the battery size for that model is CR2412. (Note - be sure to get the correct instructions; different models have different battery sizes.) "Automatic" Divers watches have no battery, they are powered by a spring mechanism.

Seiko automatics do not wind just shake it side to side a couple of times then wear it it self winds

abdulrazed, you have not said what the problem is. Has it stopped completely or is not keeping time or what? Whatever it is don't mess with it. These are good watches. Take it to a good jeweller(watch repairer) and get it cleaned and running.

Main cause would be that the date gear teeth have been stripped. This is done by setting the date whilst the hands are trying to change the date themselves (between 10pm and 2am). Always adjust the date with the hands around 6.0clock. You will need to return your watch to where you bought it for repair I'm afraid.

mcdevito75 here, Your Jeweler had to mention your watch would go to Seiko for repairs. Seiko should notify you or your Jeweler with the repair particulars.

mcdevito75 here, hello Diane, I'm afraid your jeweler is correct, and so are you. It is adviseable to pull the stem out to save the battery BUT, only if your not going to wear your watch for a long time, not just over night, here"s the problem!! the quartz mechanism and most of the works are plastic, and plastic while fairly flexable when new, gets hard over time, your pulling the stem to stop the watch everyday or even once a week most likely broke the switch in the mechanism that starts the watch, if so your only option is to replace the movement if you can get one. Pull the stem to stop your watch only if your not going to wear your watch for say 2 weeks toa month.

DO AMASTER RESET TO YOUR WATCH!PULL FULL OUT THE STEM(CROWN)THEN TURN THE HANDS TO THE RIGHT TIME THEN RESET THE CHRONOGRAPH AND THE ALARM WITH THE TWO BUTTONS(SEE YOUR MANUAL.IF YOU HAVENT TRY TO DOWNLOAD IT FROM ANY SITE OF SEIKO SUPPORT).THEN PUT THE CROWN IN.IF THE PROBLEM REMAINS THE ONLY SOLUTION IS THE SIKO SERVICE!THEY ARE NOT EXPENSIVE AND MAKE GOOD WORK!DONT GIVE THE WATCES EVEN FOR THE BATTERY TO THE MONKEYMAGICIANSGURU JEWELERS THEY ARE WATCH RUINERS!

Have the batteries checked and an "AC" done to it. These watches generally have several batteries and the die off can be slow and only fail partially. The "AC" or all clear function will reset the circuit board and bring all your functions back.
As with any dive watch, be sure that you take it to a watch maker/technician that can reseal and pressure test the watch to insure it is safe for diving.

take watch to a jeweler, or pawn shop and have it cleaned and oiled.

if your caliber is automatic 7s26b something is wrong with the hair spring try a seiko service center anyway isnt something that you can fix by yourself!beware!far away from jewelers and local battery changers and other monkey magicians!automatic watch calibers are delicate and they ruine them!