Although it says "rust free" in his sig, I think he means "relatively rust free, for a 24 year old car located in Ohio". I looked at the large size closeups of the rusty spots.
That being said, it looks like the car attracted significant interest and might have brought more than the $1,625 bid if it was a "No Reserve" auction.
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1979 240D, 4spd manual, Power Sunroof, manual windows, 147k miles, Pastel gray/Black MB Tex.
1991 300D 2.5 - Smokes like it's on Crack!