A good friend of mine has a Datejust he inherited from his father. It's a 1984/86 model, TT. He wants to sell it to me for $1200. If I get it I will have to send it in for service and this will more then likely run me another $600-800. I've seen the watch and it seems to be in good condition. He wears it all the time and says it runs fine. He's looking or the box and papers, but he's not sure if he has them. I'm new to the Rolex obsession having just bought a GMT ll 16710 LN, so I am seriously thinking about adding this to my new collection. Is this a good deal?