It is hard to tell between all of the different old Ford models unless you're really into antique tractors. Starting in the late 50's they introduced a three-digit numbering system. About the same time (maybe '55-57) they came out with a diesel...but it was not a 9N. It was something like a 501 (unsure.) The sheet metal doesn't look original to me, but nonetheless it's probably a fine tractor for pulling around the grandkids, mowing, and other chores. Have fun with it!
