According to the seller, the watch was serviced for the last time five years ago, but has been almost never worn.
I've been watching her for about 24 hours now. She has lost 2 seconds and therefore keeps the time wonderful.
Also according to the seller, the amplitude is still very good.
Should I still have a service done as a precaution or only do something if the functionality deteriorates?
Of course I will have a look at the WR and seals.
Best
Thomas