The paint on the John Deere shown looks like base coat clear coat, that has been wet sanded and buffed. Unless your set up to do this it would be a little hard to duplicate. Keep in mind that something this nice would be hard to use with out scratching. This is more of a show type tractor. I recently sold a JD LA (1942 vintage) that I did this type of paint job to a lot of time spent of both the body imperfections, as well as the paint.
If you plan on using the tractor keep the finish to a minimum. I used regular JD enamel for both the green and the yellow. Spray is always best if you have the equipment and space to do the job.