Hi all. I dragged this out of my dad's garage. I believe it's a 1984 but cannot decipher the model code. Any ideas?

Hi guys. I just bought a Montgomery Ward 18/44 4 speed tractor with an18 hp Briggs and Stratton twin.Bought it to use the motor as a replacement in my Huskee(Kohler Courage engine blewup-again!)for a hundred bucks.Got it home and quite honestly,it's in too nice of condition to steal the motor...