I think most people know that authorship was credited in the old Watchtower literature, but at some point everything became anonymous. I still do not know exactly when this started, but I found this in Charles Taze Russell's last will and testament. His will was not honored in other respects, so I doubt they would have honored this request. It's interesting that he only wanted this to happen after his death. Does anybody know when or what year Watchtower writings became anonymous?
From Russell's will:
The names of the Editorial Committee (with such changes as may from time to time occur) shall all be published in each number of the journal--but it shall not in any manner be indicated by whom the various articles appearing in the journal are written. It will be sufficient that the fact be recognized that the articles are approved by the majority of the committee.