In 1966 Jehovah's Witnesses published an article which stated that the fall of 1975 would be 6000 years since man's creation. This led some Witnesses to speculate that the end would come in that year. Belief in the prediction was held only by a relatively small number of Jehovah's Witnesses in the United States; whereas most Witnesses were unaware of the prediction. Some subsequent publications either cautioned against the prediction or stressed it was only a possibility, though some continued to affirm that 1975 would "probably" be the end.
Life Everlasting in Freedom of the Sons of God. Watch Tower Society. 1966. pp. 29–35; The Watchtower March 15, 1980. Pages 17-18