My local library has the Studies in the Scriptures by Russell. Here are a few quotes for Vol. 2, 1906 edition.
1872
Six Thousand years from the creation of Adam were complete in A.D. 1872, and hence that since A.D. 1872, we chronologically entered upon the seventh thousand or the Millenium."
p. 33
1874
Chapter seven is devoted to showing that 1874 began the 40 year great harvest (converting people).
"A.D. 1874 when Christ the Brideroom and Reaper actually came." p. 240.
1878
The Kingdom of God is already begun, which is pointed out in prophecy as due to begin the exercise of power in A.D. 1878, and that the "battle of the great day of God Almighty" which will end in 1914 with the complete overthorw of the earth's present rulership, is already commenced. p. 101.
1878 will be the end of the period of disfavor to fleshly Israel. p. 218.
My comment,
It was reading things like this, many years ago, that got me out. I had no internet or books by others to read. The WT's own writing did it for me.