PRE WWI scovill model 1907 m

I believe its made out of steel,  not quite sure. Got passed down through my family, got it from my uncle. Been doing research on it and found out its from pre WWI era. Top part can come off, two other parts on the top jiggle a little bit and im sure could come off but are rusted on from being so old. The bottom part (shell) is completely empty.