Question for you all re: servicing. My main watch, a fairly simple chronometer (officially certified, no less) is now 8 years old. Apparently it should be serviced every 5 years or so, although since I alternate (these days around a month on the wrist with a month 'rest') due to having another favourite watch. Anyway, it still keeps 'COSC' time, i.e. within the range - in my case it loses about 1.5s per day, which is in spec, and has been like this since new. The watch is otherwise almost as new - very few marks etc. I take it that it's safe to leave it for a service until its timekeeping starts to waver? Services are quite expensive and I've heard a lot of bad things about unnecessary work being done; as far as I can see, there's nothing external needing doing, other than (perhaps) a very light polish of the retaining clip and clasp. What have others here done?