I would like to get this Omega Speedmaster Professional serviced as it hasn't seen one in at least twenty years, as you can tell from its condition. Although I plan on wearing it I am worried about parts being replaced and devaluing the watch. In your opinion what (if anything) should be done to the watch? Would an ultrasonic clean and lubrication be good enough? What would you do if this was your watch? Thank you. Sidenote- The watch is in working condition.