My apologizes, since I have not owned one of everything I can only go the literature I have. In this case I have almost every Tokheim Bulletin (this is the very first piece of literature Tokheim printed about a new product). My collection consists of over 700 Bulletins printed between 1900 and 2002 when they went bankrupt.
Tokheim, and just about every pump company made changes in their products that they did not bother to put in any piece of literature. This is why we are left to try and determine when these changes were made.
Actually, from a person who has a great deal of literature, changes made by Tokheim are many times easy to determine, but...try and determine when Guarantee Liquid made changes in their so called Fry pumps. This effort may take more than my life time.