Just to check what is the reason when you decide to send for servicing?
1) The date when it was 'born' and send for servicing after 3 to 5 years even it is still in good condition? Or
2) The time clock is out of track +/-10sec or more daily? Or
3) It had been an white elephant for years and service it when wanted to wear?
Of cos if there is a problem with the watch then service is logical.