I believe it is a 1975 model. My dad owned it for 3 years and I have had it for 5. The only things I have replaced on it are the steering gearbox bearings, muffler and front wheel bearings. The steering gearbox on these models will fill up with water over time and rust the bearings. You can tell it's filling up with water when you see the oil start seeping out around the bolts that hold it together. It's a real pain replacing the bearings and getting the worm gear lined back up. I'm thinking about drilling a hole at the base of the gear box and putting in a small shut off valve to just drain the water out as it builds up. You can add more oil through the small rubber plug in the column. The hour meter says 938 but I figue it's probably got about twice that since it is a mechanical tach. The engine never smokes unless I get on it hard and only for a second or two. I am starting to see a small amount of seepage around the injector fuel lines going into the injectors. I am going to replace the alternator this winter as I have to charge the battery a couple of times during the summer. I use the tractor almost everyday. Other than that, no other leaks and everything works. I did put an oil pressure gage on it as I don't like idiot lights.