I believe you will find that the FS1020 is a 1020mm wide tiller(apx 40.2 inches) From what I can see it appears to have a slip clutch which is a good thing, One of the important things is to make sure it turns in the proper direction for your tractor so you will have to determine the rotation direction of your tractors PTO and then turn the tiller in the same direction to see if it turns correctly for you, You may want to check the gear box to see how the oil looks and has not obvious signs of water or metal fragments,and the chain drive on the drive end should be checked to see what condition the chain and sprockets are in. I would also check all the tiller tines and the main shaft to make sure there is not any excessive wear, A check over of the housing for rust or breaks that will need to be repaired.
Just from what I can see in the pics it appears to be missing some tiller tines
Does the price include the goat?