identification - What are these shell case markings? - History

I have this shell case which was handed down in my family. We know very little about it and wondered if anyone can help identify the markings. I would be very grateful for any assistance.

Cartridge (firearms) - Wikipedia

History of writing - Wikipedia

Shell (projectile) - Wikipedia

SHELL CASING MARKINGS - Arms and other weapons - The Great War (1914-1918) Forum

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

7.62×39mm - Wikipedia

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

Gun serial number - Wikipedia

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

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

Large calibre markings (The Western Front Museum)

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