From chapter one "Why Human Creation Will Yet Be Set Free" in the book Life Everlasting In Freedom of the Sons of God (pages 29-30):
31. . . .According to this trustworthy Bible chronology six thousand years from man's creation will end in
1975, and the seventhperiod of a thousand years of human history will begin in the fall of 1975 C.E.
32. So six thousand years of man's existence on earth will soon be up, yes, within this generation.
43.
HOW appropriate it would be for Jehovah God to make of this coming seventh period of a thousand years a sabbath period of rest and release, a great Jubilee sabbath for the proclaiming of liberty throughout the earth to all its inhabitants! This would be most timely for mankind. It would also be most fitting on God's part, for, remember, mankind has yet ahead of it what the last book of the Holy Bible speaks of as the reign of Jesus Christ over earth for a thousand years, the millennial reign of Cnrist. Prophetically Jesus Christ, when on earth nineteen centuries ago, said concerninghimself: "For Lord of the sabbath is what the Son of man is." (Matthew 12:8) It would not be by mere chance or accident butwould be according to the loving purpose of Jehovah God for the reign of Jesus Christ, the "Lord of the sabbath," to run parallel with the seventh millennium of man's existence.
As usual, sorry for the formatting problems. Interesting use of the term generation. "Evidently" the word 'generation' didn't mean what they thought it means.