military - Can anyone tell me anything about the markings on these shell casings? - History Stack Exchange

These shell casings have been passed down. Can anyone tell me anything about the markings?

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i.stack.imgur.com/Z5TaE.jpg

MY CASE BUILDER Foam Insert, Handgun, Ammunition Mag Storage for .50 Caliber Ammo Cans

Please help me identify this shell - Arms and other weapons - The Great War (1914-1918) Forum

Identifying – Stephen Taylor, WW2 Relic Hunter

Darley Defense Catalog by Darley - Issuu

Case Club 24 Magazine Holder .50 Cal Ammo Can Foam (Pre-Cut, Closed Cell, Military Grade Foam) (1 Count) : Sports & Outdoors