EXTREME Responsibility for 1975 would be an understatement. Here are some of my 'favorites', some quoted previously but still worth another mention:
Awake! October 18, 1966, page 19:
"In what year, then, would the first 6,000 years of man's existence and also the first 6,000 years of God's rest day come to an end? The year 1975."
Our Kingdom Ministry March 1968,page 4:
"Just think, brothers, there are only about ninety months left before 6,000 years of man’s existence on earth is completed. Do you remember what we learned at the assemblies last summer? The majority of people living today will probably be alive when Armageddon breaks out..."
Watchtower August 15, 1968, page 499 (bound volume):
"Are we to assume from this study that the battle of Armageddon will be all over by the autumn of 1975, and the long-looked-for thousand-year reign of Christ will begin by then? Possibly…It may involve only a difference of weeks or months, not years."
Our Kingdom MinistryJune 1969 page 3:
"…in view of the short time left, a decision to pursue a career in this system of things is not only unwise but extremely dangerous....Many young brothers and sisters were offered scholarship or employment that promised fine pay. However, they turned them down and put spiritual interests first."
Watchtower, October 15, 1969,page 623 (bound volume):
"More recently earnest researchers of the Holy Bible have made a recheck of its chronology. According to their calculations the six millenniums of mankind’s life on earth would end in the mid seventies. Thus the seventh millennium from man’s creation by Jehovah God would begin within less than ten years...Would not, then, the end of six millenniums of mankind’s enslavement under Satan the Devil be the fitting time for Jehovah God to usher in a Sabbath millennium for his human creatures? Yes, Indeed!"
Our Kingdom Ministry,page 3, May 1974:
"Reports are heard of brothers selling their homes and property and planning to finish out the rest of their days in this old system in the pioneer service. Certainly this is a fine way to spend the short time remaining before the wicked world's end."
The Truth Book, primary study aid for Jehovah’s Witnesses to use with Bible Students, the version published prior to the year 1975 (they changed the wording in a later revision after 1975) reads as follows on page 9 under ‘Grand Blessings from God Near at Hand!’:
“Also, as reported back in 1960, a former United States Secretary of State, Dean Acheson, declared that our time is "a period of unequaled instability, unequaled violence." And he warned: "I know enough of what is going on to assure you that, in fifteen years from today, this world is going to be too dangerous to live in." [Note: 15 years from 1960=1975]