I was under the impression that symbols (especially crosses) were not allowed in the church. "Jehovah's Witnesses teach that Jesus was crucified on a stake, and that they reject the cross as a pagan symbol. No crosses are to be displayed in the worship hall, on a person, or in Jehovah's Witnesses' houses" (page 535 of AMG's Encyclopedia of World Religions, Cults, and the Occult). Question: What do the symbols in the top corners represent, and how are these symbols associated with Watchtower?
The Jehovahs Witness teaching of the symbol of the cross was changed about the 1930's by Joseph Rutherford. Prior to this they accepted the cross that is widely accepted in Christendom today. So the magazine would still have a cross on it as it's publication was prior to this time
As far as the symbolism on the magazine is concerned. I would at a guess say that the top left hand corner is meant to represent Christ being King. And the top right as being the guardian or defender of the Watchtower
The early members of the Bible Students as they were then called did many things in contrast of the Bible. The more they studied the Bible by examining the scriptures they realized they needed to change and stop what they were doing. They even celebrated Christmas, smoked, and the use of the Cross and the Crown as a symbol of faith on the early magazines. As they progressed in the truth of God's word, they openly and publicly explained why they stopped and the scriptures to support their actions. Today JW's have so much more of an understanding of the truth (the true Christians) because over 8 million witnesses are proclaiming that truth in all the inhabited earth. They are only organized religion truly obey the commandments of Jehovah and Jesus. I hope that answers your question.