For sale is this nice Case 830 Diesel wide front row crop. The tractor was built in 1965 and is  in good running and driving  condition as can be seen in the video. The Case-O-Matic added a torque converter to the standard gearbox which could be locked up so the traditional loss of power which was the disadvantage of a torque converter didn't exist.
https://youtu.be/88TH6vYEV