40 mm anti-aircraft shell? - FIREARMS - U.S. Militaria Forum

We are cleaning out my mother-in-law's condominium and found this item in a trunk in the garage. I did a little snooping on the Internet and it looks like it's a 40 mm antiaircraft shell casing. The stamp on the head of the shell near the primer is 1943. The shell was in a round tube and the cap

40 mm anti-aircraft shell? - FIREARMS - U.S. Militaria Forum

Original U.S. WWII Bofors 40mm Gun Inert Rounds with Clip - 1945 Dated – International Military Antiques

WWII U.S. Navy Bureau of Ordnance 40mm Cannon Ammunition Display Board - ORDNANCE - U.S. Militaria Forum

Anti aircraft shells hi-res stock photography and images - Alamy

Anti Aircaft Gun, Antique Weapons

1943 M84 Smoke Round 105mm - FIREARMS - U.S. Militaria Forum

40mm shell and 37mm? Anybody know what these are? - ORDNANCE - U.S. Militaria Forum

USN 40mm Saluting shell - FIREARMS - U.S. Militaria Forum

Anti-aircraft warfare

A 40mm bofors anti-aircraft shell (1943) on the USS New Jersey Iowa Class Battleship, Delaware River, New Jersey, United States Stock Photo - Alamy

WWII U.S. Navy Bureau of Ordnance 40mm Cannon Ammunition Display Board - ORDNANCE - U.S. Militaria Forum