My father has a DateJust that's about 40 years old, and clearly in need of some service. I called Rolex to ask about their services and learned that they charge at least $650 for the full service (take apart the watch and oil the movement, replace gaskets, etc.) This seems to be a huge premium over sending it to somewhere else like Tourneau. Of course, the Rolex service is official and comes with a 2 year warranty, but what do you all think? Is it worth paying double or more to send it in to Rolex?