How do I change the battery of a Jules Jurgensen pocket watch.

This site gives maker information, but the serial number help is just waffle.

https://jules-jurgensen-serial-number-list.peatix.com/

To find what it is, click the images tab

https://www.google.com/search?q=Jurgensen+Ladies+Swiss+Wristwatch+17+jewels+rectangular+movement%2C+14K+gold+case

https://www.google.com/search?q=jurgensen+ladies+swiss+wristwatch+serial+number+lookup

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Most pocket watches open in the back. Usually you have to have a very thin bladed instrument to pop off the back of the case. Since this is a gold watch I would take it to a jeweler to look at it since it is very easy to scratch up the case if you aren't careful.

While the firm does not appear to be selling watches any more, they still repair them, although they are in America!

Go to http://www.helbros.com/ for their contact details.

All watches should arrive with battery fitted. As now there are too many variations of watch movements, it's impossible to tell exact battery code without seeing the watch. Nearest watch repair shop will be able to tell you that.

Possibly the mainspring has been broken. I am guessing that you cannot see what has come loose. The only way is to open the case back and see. If that is what has happened then it can be replaced.

The best thing to do for instructions for a Jules Jurgenssen is to contact them. You may also try retailers who carry their product.

Jules Jurgensen Helbrose International
101 West City Avenue
Bala Cynwyd, PA 19004
USA

Corporate Phone: 1-800-220-1233

Its like a clasp just use a knife an open it at back case you can groove where you placed the knife tip.

Hope it may helps:

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They'll replace for free - Battery $8
Watch how they do it with their tools and you'll know how to do it yourself in the future.
Good luck