They came out in the early 80s while Engineering Products was still manufacturing the metal body tractor. I think the earliest it can be is 1982. If it has the 4 speed transmission, it might be worth the asking price if it's in real nice shape. Transmission is fine, it's the clutch that you have to worry about. If all you are going to do is mow with it, then you're probably ok as long as you don't abuse it.