In Russell's day, the WTS taught that Armageddon was coming in 1914, and that the 1,000 year reign would start shortly after.
*** yb00 p. 152 Czech Republic ***He distributed C. T. Russell’s book TheBattleofArmageddon and proclaimed with conviction that world catastrophe would occur in 1914.
*** yb75 p. 103 Part 1—United States of America ***After early October 1914, Christ’s anointed followers proclaimed that the Gentile Times had ended and that the nations were approaching their destruction at Armageddon.
1915 "The present great war in Europe is the beginning of the Armageddon of the Scriptures (Rev. 19:16-20). It will eventuate in the complete overthrow of all the systems of error which have so long oppressed the people of God and deluded the world. We believe the present war cannot last much longer until revolutions shall break out" (C.T. Russell, Pastor Russell's Sermons, p. 676, Sometime during World War I)
1916 "The Bible chronology herein presented shows that the six great 1000 year days beginning with Adam are ended, and that the great 7th Day, the 1000 years of Christ's Reign, began in 1873." (The Time Is At Hand, Foreword, p 2, 1916)
1916 We see no reason for doubting, therefore, that the Times of the Gentiles ended in October, 1914; and that a few more years will witness their utter collapse and the full establishment of God's kingdom in the hands of Messiah." (Watchtower Reprints, VI, Sept 1, 1916, p. 5950)
Watch Tower,1 September 1916, p. 265
" our eyes of understanding should discern clearly the Battle of the Great Day of God Almighty now in progress of the glorious outcome of Messiah's Kingdom"
http://www.ctrussell.us/
In Knorr's day, it was taught that Armageddon was coming in 1975, and that the 1,000 year reign would start shortly after.
*** w68 8/15 p. 499 par. 30 Why Are You Looking Forward to 1975? ***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.
*** w67 7/15 pp. 446-447 The Removal of Mankind’s Chief Disturber ***According to the Bible timetable, man’s history on earth has been nearly 6,000 years. Adam was created in 4026 B.C.E., which means that six thousand years of human history end about the fall of 1975 C.E. We are in the great 7,000-year rest day of God, starting at the time he rested after the creation of Adam and Eve. There are, therefore, a thousand years left to run.