Yeah.... Uh this IS NOT CW era ordinance, it will be WW2 to roughly Vietnam era based on how it looks.
To address another question of safety.... If you find a MODERN shell of this type, with a threaded fuse either in the nose or base, LEAVE IT ALONE. over time corrosion can make the fuses unstable and a jolt can potentially detonate them. You do not want to be anywhere nearby one of these things going off. These are dangerous if they've been in the ground and should be left to a professional.
This one having no fuse is nothing to worry about, since there is no means of detonation if there even happens to be a bursting charge left inside. If you're uncomfortable handling it, then leave it alone, but consider looking for a collector in your area and telling them about it before calling the bomb squad, they will be able to identify it and determine if it is safe.