my guess
My guess is that it is a 54 Buick. That is based on the rear window, but I could be off a year or two. Can't tell condition of the car without more photos, especially of the floorboards and trunk for rust. Is it all there? I would suggest rolling it out in the sun and taking lots of pictures, under the hood, of the frame, in trunk and of the upholstery. BTW, I find the best way to determine the value of a car is to watch Ebay for awhile and see what similar cars bringing. But remember, the pictures always make a car look better than it is. I add things to my watch list so I can see what they bring in an auction or a buy it now. If you don't add them to your watch list they just disappear and you won't see the selling price. I hope this helps. Kurt