These are hand hammered Brass shell casings, a WWI form of distraction from the tedious Trench War in France. Wh I'll le I have seen numerous examples, I have never seen one of a soldier in combat, and definitely not one with a gas mask with pistol drawn. It is quite dramatic. Also, the Statue of Liberty is unusual. I might point out that they are also bearing the words World War, which was later named World War I after the second World war happened.