Wow! I haven't seen a 4 way levelling combine harvester in decades! We used to farm wheat and barley in the hill country of Eastern Washington in the United States. My father had an International Harvester model 403 with a 4 way levelling system. The 403 was produced from 1968 to 1973 (if memory serves me) and then International produced the model 453 from about 1974 to 1976 or so. Those were the only 2 combine harvester models that we know of that were produced in the USA. I don't know of any other manufacturer who offered a 4 way levelling system. International designed these 4 way levelling combines for the Palouse region of Washington State. That area is a few miles to the south of our farm and there are very steep hillsides much like your field there. There was no great need for 4 wheel drive, though, because the ground is much drier there and traction isn't as difficult to maintain. This was just fascinating to watch! Thank you.

 

I drive big reds and would have never thought to see a header like this before. Incredible how fast farm machinery advanced in the last 100 years. From this to berry pickers, sprayers and spreaders. We have advanced as a race faster than we seem to think when it comes to technology and engineering for these applications. Aeroplanes are cool and all, but these things keep my belly full!.