What is a good price to pay for a 1987 Toyota Supra automatic(not turbo) with 113K miles?

It's for sale for $6600, 113K miles, has a really impressive beige interior, although obviously very old and worn out. I'd put it closer to 'good' than 'fair' condition, and a body/repair shop is selling it, so I don't know how that would impact the price. It has an 'ECT' button which is either primitive traction control or adjustable dampeners(I don't know for sure). $6600 seems a bit steep for them to ask, but I could be wrong.