I can’t help you with the PDF booklet for your machine, I’ve searched around plenty myself looking for general information on the lineage, history, and Honda model progression down over the years. Without much success. Apart from link I was given to their own Honda website, that has good information on their first tillers.
Where do the F90 & F100 come in early 70’s, 60’s??
Does your tiller have differential lock? Selection of gears? What hp is it even!?
It’s a fine looking machine and I’m always shopping around myself, looking for similar or newer versions of these multi usage Honda tillers.

There’s a photo in the spring 1977 issue of the Agricultural Machinery Journal for the smaller F80. There’s also a snippet of text regarding what was on sale at that same time.