What year specifically? You just state 1950's. The Customline was produced between 1956 and 1956. You also don't state whether or not it is a 2 door, 4 door or wagon, because that can make a difference in the price too. How much did the guy offer? Without seeing any pictures or knowing what type of engine transmission, etc. are with the vehicle it is really hard to say. It could be the difference between $500 to $3000.