I echo what Brad (bgott) said, but with one addition. Ford also made an NAA model in 1954, but it was not called the Golden Jubilee like the '53 model. It was just called a Jubilee. I own one of these tractors. Depending on the type of hydraulic pump and condition of the tractor, they are currently selling from $2,500 up to $4,000 or more in rare instances. Anything more than $4,000 should be in near "show" quality and condition. It's possible that the tractor you are looking at is a 600 or 800 series model. If it is indeed an NAA, the "NAA" should be stamped on the engine casing just behind the starter. You might have to scrape a little paint to see it. You really do need to know the model before making a price judgement.
JimI