Mine is a set of Lichfield foundry cambridge rolls , must be 80 years old if not moreMaybe we start a thread for the oldest piece of kit still used on the farm?
Mine would be a 1960 something Lister Crop Cool fan. Still used every year.
Then a 15 foot set of Ransomes folding Spring Tines my father bought brand new in 1972 (originally pulled behind a Fordson Power Major!) . Dragged out of the nettles occasionally!