Vanderhoven7,
While searching for details of the persons who were "appointed" in 1919, keep in mind that you are not searching for the precise expression "faithful and discreet slave". It is probable that that term did not appear until they released their NT in 1950. Before then, they could have used the expression as it appears in the KJV or similar.
The following from Wikipedia provides some clues - although lacking details - which might provide a guide where to search:
"The doctrine has undergone several major changes since it was formulated in 1881 by Charles Taze Russell, founder of the Bible Student movement. Russell initially applied it to the "church"—the "little flock" of 144,000 who would go to heaven—but five years later explained that it was an individual who would act as a sole channel or agent for Christ, dispensing "food", or new truths, for God's "household". Bible Students consequently regarded Russell as the "faithful and wise servant" of the parable.
"In 1927 the Watch Tower Society announced that the "servant" was not in fact an individual, but was made up of the entire body of faithful spirit-anointed Christians; by 2010 that group numbered about 11,000 Witnesses from around the world. In 2012 the society announced an "adjustment" of the doctrine, explaining that the slave was now understood to be synonymous with the Governing Body, a small group of anointed elders serving at the religion's world headquarters. The announcement also marked a change in belief about the timing of the slave class's appointment by Christ: it was said to have taken place in 1919 rather than in apostolic times, as previously believed." (http://en.wikipedia.org/wiki/Faithful_and_Discreet_Slave accessed 19 July 2013)
------------------------------
Do not be misled by their readjustments of history. When did they realise they had been appointed in 1919? Had they gone through life before then without realising they had received the most royal of appointments?
Doug