My son has a Timex pocket watch-I just got the back off with a very tiny flat-head screwdriver- the niche or indent you're looking for is almost indiscernible; look very closely, the edge of the back barely deviates from where it meets the edge of the front piece. Looks more like a flaw than an intentional point of entry
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Waterproof or water resistant watches usually need a wrench to unscrew the back. I use a pair of 90 degree circlip pliers. A jeweller would remove the strap and fit the watch into a holder before using the wrench.
Few jewellers would guarantee the water resistance of a watch after fitting a new battery. If it is required a watch be returned to its original specification it must be returned to the manufacturer or an agent for battery fitting and pressure testing.
Some watches have a back that is pressed into place. Fairly easy to prise off but very difficult to replace without the tools. This type does not have the grooves a wrench fits into.
First -let's check out what type of watch you have. If you push the crown in and it turns freely back and forth with no resistance at all - this is battery driven watch. If you do the same and feel and hear some clicking and resistance- this is mechanical (spring driven) watch. Next - the case: Usually all pocket watches have snap-on casebacks. Take an eyeglass and examine the case. Even if you think there is no any grooves or gaps- try to pry it using watchmakers caseback opener (about $5 on ebay). In case if there are no chance to open caseback - that means you have one of the cases assemblad watch glass fitted last and that means you have to take glass out first and then only to get to the movement. As you will not be able to get the glass out without braking it, the only solution will be to visit your nearest watchmakers shop and ask for help.
To open the front, try a toothpick in the hole. You will need to get the stem replaced.
To open the back:
Flip the watch over and look around the edge. There will be small slots. A thin blade like a pocket knife will open the back cover. Carefully, put the knife blade into the slot and twist it open. There isn't much user serviceable stuff inside.
If you want to do this yourself, on the back of the pocket watch if you look at the seam going around the back, you will see a little notch. With a solid knife ( a pocket knife will suffice) take the edge of the knife and put it in that slot and pry up. The back should come right off. The battery probibly will be a 371 which will be covered a little with a piece of metal with a liitle hole in it. Take a tweezer ad GENTLY pull the metal piece away from the battery, and the battery shoul pop out a little. After you do that take the new battery and go backwards from how I told you to take it out. When putting the back back on just press with your hands and it should just snap back on. If you still have problem please let me know and I will be glad to assts you futher.Good luck!
Turn the watch sideways & look around the edges of the back of the watch. You may have to use a magnifier to do this. Look for an area that has a gap. Put the knife there & pry it open. Hope this helps.