I sold my 83 300SD on ebay last year for $2400.

272k miles
Everything worked, including air and cruise. CD radio, nice tires.
Very clean cosmetically, except for a cracked dash, and minor dent in driver's door.

No rust at all.

Jim

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14 E250 BlueTEC black. 45k miles
95 E320 Cabriolet Emerald green 66k miles
94 E320 Cabriolet Emerald green 152k miles
85 300TD 4 spd man, euro bumpers and lights, 15" Pentas dark blue 274k miles