Markings on bottom of shell casing : r/MilitaryHistory

File:3inchCaseShotMkVDiagram.jpg - Wikipedia

WW2 British Artillery Shells and Mortars – Colours and Markings – Stephen Taylor, WW2 Relic Hunter

Large calibre markings (The Western Front Museum)

Shell (projectile) - Wikipedia

7.62×53mmR - Wikipedia

Cartridge case terminology and identification – Stephen Taylor

File:Mark Briggs, WW1 Conscientious Objector (16762372066).jpg

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

9×19mm Parabellum - Wikipedia

German Shell Casing Markings - Arms and other weapons - The Great War (1914-1918) Forum

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Help in Identifying marks on shell casing - Arms and other weapons - The Great War (1914-1918) Forum

Trench Art - Ammunition, Brass shell casing, 1941

Lot 20 - A WWI brass shell case

military - What kind of rifle used this shell case? - History Stack Exchange

Identification German WWI Artillery Shell casings brass and steel - LATEST FINDS - U.S. Militaria Forum

105MM M14 BRASS ARTILLERY SHELL CASING - Kidd Family Auctions