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.

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

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

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