28k-32k depending on condition and whether he can find the records. That means proof of miles as it is concerning the seats and paint are not perfect with such low miles if real.
Seems like these cars have gone up a good bit this year. Two years ago there would be 3 pages of 84-89 911's for sale on ebay now less than one page as these cars go overseas.
For comparison this care sold in a week with multiple offers on asking albeit in a rare color but with much higher miles :
Excellence :: Cars for Sale : 1985 911 for sale in Tallahassee, FL