WW1 German Cartridge Case Markings - Arms and other weapons - The Great War (1914-1918) Forum

Hello Everyone, Please can anyone tell me what the German markings denote please. I believe it is a 7.7cm case but will stand corrected. Also what type of gun would it have fired in? Many thanks in advance

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WW1 German Cartridge Case Markings - Arms and other weapons - The Great War (1914-1918) Forum