For the Witness Lurker, this info is taken from WT CD under books (Gods Kingdom Has Approached) 1973, chapter 11, p.206
THE
CORRECTING OF A MISUNDERSTANDING(emphasis mine)
48 It is true that the editor and publisher of Zion’s Watch Tower and Herald of Christ’s Presence calculated that the "presence" or parousia of the heavenly Bridegroom began in the year 1874 C.E. Also, that the date of the first man’s creation by Jehovah God was in the year 4128 B.C.E., which meant that six thousand years of man’s existence on the earth ended in the year 1872 C.E., as calculated by Russell and his associates. This reckoning began to be announced on the front page of Zion’s Watch Tower and Herald of Christ’s Presence beginning with the issue of July 1, 1906, and this practice continued down through the issue of September 15, 1928. For instance, on the first of such mentioned issues appeared the date of issue: "July 1, A.D. 1906—A.M., 6034"; whereas the dating of the last mentioned issue was: "Anno Mundi 6056—September 15, 1928." The Anno Mundi or "Year of the World" date was calculated to be the year 4128 before our Common Era.
51 Accordingly, on page 53 of the book entitled "The Time Is at Hand," author C. T. Russell wrote, referring to 1 Kings 6:1:
It evidently should read the five-hundred-and-eightieth year, and was possibly an error in transcribing; for if to Solomon’s four years we add David’s forty, and Saul’s space of forty, and the forty-six years from leaving Egypt to the division of the land, we have one hundred and thirty years, which deducted from four hundred and eighty would leave only three hundred and fifty years for the period of the Judges, instead of the four hundred and fifty years mentioned in the Book of Judges, and by Paul, as heretofore shown. The Hebrew character "daleth" (4) very much resembles the character "hay" (5), and it is supposed that in this way the error has occurred, possibly the mistake of a transcriber. I Kings 6:1, then, should read five hundred and eighty, and thus be in perfect harmony with the other statements.
Thus, by inserting 100 years into the Bible chronology during the period of the Judges, man’s creation was pushed back 100 years to 4128 B.C.E., and the six thousand years of man’s existence on earth ended in 1872 C.E.
(The Time Is at Hand, page 42) Then the allowance of two years before the entry of sin led to the year 1874 as the year in which six thousand years of human sin terminated and the seventh thousand years for the elimination of sin by Christ’s reign began. So the Grand Jubilee was then due to begin.
54 The insertion of 100 years into Bible chronology during the period of the Judges is thus seen not to rest upon Scriptural grounds. The insertion should therefore be dropped and the Bible should be accepted just as it reads concerning its chronology. Unavoidably, then, this would affect the date for the parousia of the Bridegroom Jesus Christ to begin. With the Watch Tower magazine’s issue of January 1, 1939, the title was changed to The Watchtower and Herald of Christ’s Kingdom, and with the issue of March 1, 1939, to The Watchtower Announcing Jehovah’s Kingdom. This did not mean that the publishers of the magazine no longer believed in the presence or parousia of Christ as being then in progress. It meant, rather, that more importance was given to the Kingdom, to the kingdom of Jehovah God by Jesus Christ, for it is Jehovah’s kingdom by Christ that will vindicate Jehovah’s universal sovereignty.
55 In the year 1943 the Watch Tower Bible and Tract Society published the book "The Truth Shall Make You Free." In its chapter 11, entitled "The Count of Time," it did away with the insertion of 100 years into the period of the Judges and went according to the oldest and most authentic reading of Acts 13:20, and accepted the spelled-out numbers of the Hebrew Scriptures. This moved forward the end of six thousand years of man’s existence into the decade of the 1970’s. Naturally this did away with the year 1874 C.E. as the date of return of the Lord Jesus Christ and the beginning of his invisible presence or parousia. The millennium that was to be marked by the detaining of Satan the Devil enchained in the abyss and by the reign of the 144,000 joint heirs with Christ in heavenly glory was therefore yet in the future. What, then, about the parousia (presence) of Christ? Page 324 of the above book positively says: "The King’s presence or parousia began in 1914." Also, in the Watchtower issue of July 15, 1949 (page 215, paragraph 22), the statement is made: " . . . Messiah, the Son of man, came into Kingdom power A.D. 1914 and . . . this constitutes his second coming and the beginning of his second parousía or presence."
ROCKHOUND