Another pre-purchase inspection guide, with pictures. Was written using an early car, so some items will be different if you go look at a 1980 and later W123, but the general reference will help.

https://www.ifixit.com/Guide/Mercedes+W123+Diesel+Pre-Purchase+Inspection/21003

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1979 300D 040 Black on Black - 1985 300D Maaco job (sadly sprayed over 199 Black Pearl Metallic) on Palamino

http://i.imgur.com/LslW733.jpg

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