First off, verify that is the actual mileage. The gears in the odometer tend to break, which will allow the speedo to work properly, but the odometer just won't accumulate mileage. Any time you see low mileage on one of these cars, that is worth looking at. A dead giveaway without even driving the car is if the trip odometer is sitting at all 0's, most likely the odometer gears are broken, and in that case, figure that the mileage could be anything, and price it accordingly. If it really is a 50K mile car with no rust, no faded paint, no wear on the seats, and no mechanical issues, I would say it is probably worth about $3500. If it is clean with no issues and unknown mileage, figure about $2000. And if it needs paint, or rust repair, or the interior redone, or the suspension overhauled, the price will go down from there.