Why did this Early Version of the Watchtower Magazine include Crosses, and what do these other Symbols on the Magazine Represent? The following is "Zion's Watch Tower and Herald of Christ's Presence, October 1, 1907."

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

Facts about Jehovahs Witnesses

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