Between the years of 1963 and 1973, John Deere produced 80,000 units of their iconic Model 80 tractor. The machine was popular for its durability and versatility on the farm, and many of these units are still in operation today. While the company has not released exact production numbers for each year of the Model 80's production run, we do know that 20,000 units were built in 1963 alone. With such a large production volume over a decade-long period, it's safe to say that the John Deere 80 remains one of the most successful tractors in history.