It was never said that armageddon would happen in the fall of 1975.
True enough, as far as it goes - but ONLY as far as it goes!
The thought was certainly left hanging there, and it was obvious even to Blind Freddie that this was the conclusion the WTS wanted its readers to deduce from their writings. This started with the 1966 book Life Everlasting in Freedom of the Sons of God - on page 29 of which the term "appropriate" was used to link 1975 with Armageddon. It then continued over the next several years with a series of magazine articles, which got more and more pointed. One article was even entitled Why are you looking forward to 1975? That one was very explicit, talking about it being only "weeks or months" rather than "years" between the end of 6000 years of human creation and the "end of the system". It also effectively debunked the cautionary statement of Matthew 24:36, (i.e."no one knows the day or the hour"). This magazine article told its readers that it was not the time to "hide behind" those words - talk about the Watchtower being more important that the Bible!
So, yes, you are correct that the WTS didn't straight out say that Armageddon would happen in the fall of 1975:
- BUT they also made it plain that the event could easily occur within "weeks or months" of that time; and that furthermore, this would be quite "appropriate".
Most readers of these works of propaganda drew the conclusion that the writers intended them to arrive at!