Thinking of selling my 1984 300CD Turbo Diesel ...

I have been asked by several people if I want to sell my 1984 300CD Turbo Diesel. Does anyone know where I can find an asking prce for it? It is in good/very good condition with only 82,000 miles and runs great. I have tried Kelley Blue Book on line, but I can only find cars back to 1987. Is there a special site where I can find the value of older cars or does anyone have a suggested price?
Thank you in advance for any help.

I'd be interested in the car, if you settle on a price.