How Much Does It Worth For A Kawai Ge-2 Piano?

I’m shopping for a piano and found Kawai GE-2 Grand Piano on Craigslist. It is from the 80s. How much does it worth? Here’s the description “It is a beautiful K Kawai Grand, 6′ long, polished black in extremely good condition, and in very good tune. ”
What’s a good buy? Please help me expert. Thank you very much.