Sony kv-2142r ???

[cjacek]

Hi,
I'm in a bit of a quandary and was wondering if someone here can help? The other day I found a local guy selling a SONY KV-2142R with remote. He is the original owner, bought this TV in 1980. It's in like-new condition. From the model # it looks like it's a 21 inch screen. Other than that, nothing more can be found. I'm especially interested in the going value of this set because I'm trying to make an offer to the seller but at the same time not "low ball him". He seems to be attached to the TV still because his asking price is very unrealistic. He wants $500 for it (yeah, I know) but he says to make him an offer. Does anyone have an example of this model (or similar) being sold and the final price recorded? That way I can show him and it'll convince him that I'm making a fair market offer. As it stands I have none of this info available to me. I love those old trinitrons but have never seen this model. How does it stack up quality wise? Photo attached.
Thanks in advance for your help.