Whenever an Allis-Chalmers 440 shows up on an auction, it always grabs my attention. Granted, this one is prettier than most, but otherwise is no different. At any rate, the way these tractors came about is kind of interesting. Let’s dig in a little deeper, shall we? Along the way, we’ll take a look at this one that lives in South Dakota until it sells on an auction wrapping up on Nov. 6.