I dont have the model number on hand but I have a 52 inch sony(not widescreen) from 2001 that I dont use anymore. Someone is interested in buying it and I have no idea what a good price would be to sell for.
Nothing is wrong with the TV other then I have noticed the picture quality over all has gotten worse.
I would guess the optics are dirty(lenses and mirror) that could cause the picture quality to get worse over time. Cleaning them especially if it hasn't been done in awhile will do wonders for the picture as will doing the convergence.(it is a CRT Rear projection tv?) this may also help in selling it.
The Value for Rear proj. TV's is declining in this world of flat panel tv's and since yours is not even High def(or is it?)that makes it even a harder sell. look at your local craigslist for some idea of what like sets are going for to base your price on.