The org's very existence depends on this mystical year - a fabrication created by Mr. Rutherfraud to convince the credulous* that he & his pals had been personally selected by God Almighty as the "faithful slave" and the only true religion.
w16 March p. 29 par. 2 Questions From Readers - in 1919, Jesus appointed “the faithful and discreet slave” over God’s cleansed people to give them spiritual “food at the proper time.”
w16 March p. 31 Questions From Readers - Ezekiel 37:1-14 and Revelation 11:7-12 each speak of a spiritual restoration that took place in 1919.
w15 7/15 p. 8 par. 7 - By 1919, those approved by Jehovah and serving at his spiritual temple were clearly identified.
w14 1/15 p. 13 par. 5 - Jehovah directed Jesus to inspect and refine the spiritual condition of his followers on earth...History shows that this took place between 1914 and the early part of 1919.
* Credulity is a state of willingness to believe in one or many people or things in the absence of reasonable proof or knowledge. Credulity is not simply a belief in something that may be false. The subject of the belief may even be correct, but a credulous person will believe it without good evidence. (Wikipedia)