I found the answer myself following a trilogy of articles. Yes the F&DS were appointed in 1919; a small group of faithful Bible students at headquarters in NY.
17. What important developments began to unfold in 1914?
17 As we learned in the preceding article, the harvest season began in 1914. In that year, a number of important developments began to unfold. Jesus was enthroned as King, and the last days began. (Rev. 11:15) From 1914 to the early part of 1919, Jesus accompanied his Father to the spiritual temple to do a much-needed inspection and cleansing work. * (Mal. 3:1-4) Then, starting in 1919, it was time to begin gathering the wheat. Was it finally the time for Christ to appoint one organized channel to dispense spiritual food? Yes, indeed!
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11, 12. (a) What two appointments does the faithful and discreet slave receive? (b) When did Jesus appoint the faithful slave over his domestics, and whom did he select?
11 It is noteworthy that in Jesus’ illustration, the faithful and discreet slave receives two distinct appointments. The first is over the domestics; the second is over all the master’s belongings. Since the illustration is fulfilled only in this time of the end, both appointments would have to come after Jesus’ presence in kingly power began in 1914.
12 When did Jesus appoint the faithful slave over his domestics? To answer that, we need to go back to 1914—the beginning of the harvest season. As we learned earlier, at that time many groups claimed to be Christian. From which group would Jesus select and appoint the faithful slave? That question was answered after he and his Father came and inspected the temple, or spiritual arrangement for worship, from 1914 to the early part of 1919. * (Mal. 3:1) They were pleased with a small band of loyal Bible Students who showed that their heart was with Jehovah and his Word. Of course, they needed some cleansing, but they humbly responded during a brief period of testing and refining. (Mal. 3:2-4) Those faithful Bible Students were true Christian wheat. In 1919, a time of spiritual revival, Jesus selected capable anointed brothers from among them to be the faithful and discreet slave and appointed them over his domestics.