1987 560SEL - considering buying - need info

[86560SEL]

Hello again. I am still searching for a Mercedes. Today in the paper, I seen a 1987 560SEL listed. Address was listed and I went to look at it. The owner was not home, but I was able to view it. It is a very nice car, with 115K miles. The only exterior problem I seen was some very minor hail damage on the top, hood and trunk. The ad states that the car has been very well maintained. I am assuming it has the records with it. The price is unknown. In the paper and on the for sale sign - it says "make me a offer". The problem is, I have no idea what to offer. I would rather the seller give me his bottom dollar on the car. KBB says $4450. in good condition. The car is dark gray, with gray or tan interior. I do not recall exactly. It also has the body side moulding above the center of the car, which is something I have never seen on one of these. Assuming that it is a very well maintained car, with records- what would a ballpark figure be on one of these with minor hail damage? Othwise, it is in EC. Thanks for any information.