Hi Helena, welcome. Just make sure if you get your watch opened it is done by a professional watchmaker or by knowledgeable Omega certified people because jewelers or people who change batteries can cause damage to the case back.
I would recommend you wait for
@Archer's recommendation and not just "service" the watch.
Omega is known to practice exceedingly expensive services.
Also there are members here who may have good ideas about resources in Sweden? Calling
@styggpyggeno1 and
@marturx.
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