Serial plate went up on dash in 1952 . The work light was on right side ,red tail light on left and the seat was changed around then also . Earier models had a bar tieing around back of frame this was gone in next series of seats. I don&#039;t know if there is a engine cross over to serial number list available . If you look inside front frame you can sometimes casting date of frame.Serial number plates were on engine for 60-70-80-90-series.