As a buyer I like to give any piece a fresh start at my house via a service at the manufacturer and will factor the cost into my buying decision.
As a seller I wouldn't service a watch specifically for the sale as you typically don't recoup the cost unless, of course, a piece was badly banged up and a hard sale w/o refinishing, adjustment etc.
The flip side is that I am always a little suspicious that a piece had been neglected and/or badly banged up if a seller saw the necessity to get it serviced on his account just prior to a sale.
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