Locate the model or serial number stamped on a plate on the left or right side of the main frame. It is also stamped on top of the transmission housing.
Look through your user manual that came with your tractor to see if the model number is printed on the cover, the first page or the last page.
Take a picture of the tractor. Show the picture to a Massey tractor dealer. He will be able to identify the tractor and give you its specific model number. Alternately, compare the picture with the ones in a book about Massey tractors, such as "Big Book of Massey Tractors," by Robert Pripps or the "Encyclopedia of America Farm Tractors," by C.H. Wendel.