From what I've found, you should have a number stamped on the frame, behind the front driver side spring hanger/shackle.
Problem: It's not a complete serial number... though it can determine the year when plugged into the following chart, the prefix/model code will remain unknown.
Thanks Dr. C. I will check it out today. I thought there were some binder fellows on here also, but , hey , its a lead to look into. Again, I appreciate the effort.