Hi Ralph,
As much as I know about thrashing machines, it could be anything, but there is some similarity to our old IH McCormick combine sitting in our old pasture lot. If I remember correctly, I think the combine is a model 61 or maybe a 62. I have the original book somewhere in the garage so could look the model up. Even though the thrasher is much larger, the galvanized sheet and angle iron construction is a lot similar.
Charlie V.