I'm new at this so I'm wondering if this projectile is of WWI or WWII vintage and maybe what nationality. There are no markings on it. Its 5 1/2 inches long. The base plug/fuze is missing. The dark part of the projectile has machine marks while the tip area is polished. It appears like its two parts but it's one piece as far as I can tell. The hollow part inside ends where the polished area begins. Hope my description is OK. Any info appreciated.