I was going to say the same thing but looking at its condition I personally would not care what it might normally bring and would offer a price that I felt was fair, considering his asking price I would offer 100 bucks if I wanted it that badly and if he didnt take it than leave him your number and almost surely he will eventually call you.
Those old time machines are irreplaceable and obviousely built to last. Just because the majority of our populalation is too ignorant to see that is the reason why they are often scrapped.