JG Francis at Mercedes Motoring used to have the selling price of his cars listed on the website. Now, assuming you can trust that info, I recall virtually all of them selling for $20K-$30K. So regardless of your opinions of his work, the market definitely values the product he is selling.

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1968 220D, w115, /8, OM615, Automatic transmission.
My 1987 300TD wagon was sold and my 2003 W210 E320 wagon was totaled (sheds tear).