Tips for sightseeing Sl300 R129

Hello, I want to look at this 129er and try it outhttp://www.autoscout24.de/Details.aspx?id=vfzybxyju3mp Which things should I pay close attention to? I will of course check the engine thoroughly, known weak spot head seal and control housing. The offer seems serious. Originally the car should cost 6900,-. Funny that nobody has bought it yet. Or is the economic crisis to blame? I want to drive the car only in the summer. The series fits qualitatively very g ut to my W140 🙂 Would be nice if you told me your assessment…. MfG