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

Marking your casings - The Firing Line Forums

Forensic Marks on a Cartridge Case

i.stack.imgur.com/Z5TaE.jpg

Army Ammunition Plant Is Tied to Mass Shootings Across the U.S.

My Dad Bought A Shell And A Casing, But We Don´t Know What, 53% OFF

18 Pounder II shell case with markings, The top shell case …

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Can anyone tell me what the markings on the bottom of this shell

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Japanese brass shell ordinance markings

Cartridge case terminology and identification – Stephen Taylor, WW2 Relic Hunter