Stop in for a cup of coffee

How do you not remember exactly what year it was if you bought parts for it??
i dont know, we have this problem with one of our tractors. They made it without ANY drastic changes other than little stuff like gear knob size, hydraulic hose size etc, for nearly 12 years. And guess what, the title... doesn't have a year. and no place on the tractor does a year exist either. I was in elementary school when we bought it.