In the September 1974 Kingdom Ministry on the front page in the letter it mentions the Eternal purpose book that was in my previous post along with another book that was released at the summer assembly that year and urges the reading of the publications and says the information the 'books contain you need to know now.' and not to wait until it was covered in the public talks. Maybe it was due to this.
In the book Gods Eternal Purpose Now Triumphing for Man's Good. (1974) page 131/132
'The first half or evening period of Gods seventh creative day was now closing, 3500 years from the creation of Adam and Eve, The morning of this creative day was due to begin at 526 BCE.'
page 186
'..hurling them into the abyss and sealing them up there, bound as with chains for the next thousand.Revelations 20;1-3 pictures this, not as a part of the war at Har- Magedon, but as a follow up of that war.'
THE LINGERING SHADOW OF '75
I think there is a lingering something