First Used Rolex incoming - What to do?

[thechoson]

I have a Sub, but that was purchased new.

I've purchased other "lesser" watches used, but they were never keepers. I got them in fairly good shape, wore them till I tired of them, and flipped them.

But this one - a DJ - in a keeper.

Owner says it's about 13 years old, and has been kept in a safe for basically its entire life (owner wore it when he first received it, then put it away until now). I have no reason not to believe him.

As such, what do I need to do (if anything) when I receive the watch? Does it need a full service? I like to clean/ wash used watches upon receipt. Do I need to get it tested first for water resistance?