Shell Identification / Story Authenticity - Arms and other weapons

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WWII Trench Art, a brass shell case box, 25lb shell dated 1941 with pull off cover with South Somers

WW2 German, Soviet, Allied militaria, uniforms, awards, weapons

world war one - What's this 1917 shell casing, more exactly

What do these markings tell me about this shell casing? I know

Trench art soldier's peaked cap made from a WWI 18 pounder brass shell casing dated 1916, 10cm diame