What's f**ked up about that 1973 quote is that they admit that it was in 1943 that they changed their thinking of Jesus returning in 1874 to 1914. But in newer publications they keep harping on how the early Bible Students pointed to 1914 as the return of Jesus, not the date of Armageddon.
A short history of beliefs of the WTS:
Jesus returns in 1874. Jesus returns in 1914.
Armageddon comes in 1914. Armageddon comes in 1918. Armageddon comes in 1925. Armageddon comes in 1975. No man knows the day or hour.
King of the North is the Soviet Union. King of the North is ???
Generation is those who were alive in 1914. Generation is people who were alive anytime after 1914.
Jerusalem was destroyed in 606BCE. Jerusalem was destroyed in 607BCE.
You'd think that God's earthly organization would have a litte better handle on things, especially since God's spirit is directing it.