Open THE watch longines

SOURCE: longines, where can i download an instruction manual for master collection

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SOURCE: Longines watch problem

Some longines watch has built-in battery gauge. When battery is low, the second hand jumps every four seconds. If you have new battery installed and the problem persists then there is a short circuit somewhere that drinks a lot of battery juice.

SOURCE: My longines watch changes date

You have the watch set so that midnight is showing as noon. Advance the watch 12 hours and then reset the date to the proper setting.

SOURCE: How do I change the quartz battery on a Longines La Grande Class

Just unscrew the screw at the back if your model have screw if not the other one snap to open.Use a pocket knife then open it look the number battery and replaced it with same number battery. Its you use Renata battery it is swiss 3years to last.

Hope it may helps;

Regards;
VOTIT

SOURCE: Set the moon phase on Longines

Good day Sir, here's the link below where you can find your users manual.
hope it will help you.

manual

have a nice day.