How 'bout RUST. Really hurts value. I bought my (kinda) rusty '79 240d with 84k on the clock for $1650. No repairs that I can tell, other than the right front fender MAY have replaced at some point. The paint looks like an ever so slightly different shade of red. Nobody has ever noticed it though, almost imperceptible. My 240 is manual tranny, windows, climate control like yours.
My MB-TEX is in 9/10 shape. Only a couple little blemishes and one little tear in the drivers seat. Also, I bought the car in Missouri. Hope this helps. I do feel like I spent a bit much though, I do love my car, but I think I could have found a similar one for a little less.

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'79 240D 4 speed manual 105k miles