i may be wrong or having old man memory farts, but i do seem to recall the earliest print date for owner's manual is 69.4.
like i said, i could be wrong and may be confusing owner's manual as having 69.4 date as IS the earliest printing on the parts book.
i KNOW there is 69.5 print dates on owner's manual and 69.4 on parts book.
interestingly enough, the earliest print date on a service book i KNOW of is 69.8. The Provisional Service booklet print date is 69.6