Keystone Arms Co was a trade name used by E.K. Tryon Jr. & Co, a large catalog hardware store in Philadelphia. The gun would have been made during the early 1900's through WW2, and could have been made by any of a number of manufacturers. That serial number leads one to think H&R.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.