Looks good in the pictures, nice paint, and an interior for a Tudor doesn't come cheap. Original color for that year and body is a plus. Vagabond Green??
If it has minimal body work, a LeBarron Bonney interior, gas tank not leaking at the column support or rusty inside, clean engine compartment with a professional rebuild on the driveline, good tires, straight frame good brakes-front end-steering, $12K isn't out of line in my thinking. I wouldn't go much under that.
Best thing to do is, re-think this, keep the car if you possibly can.
Good luck.