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.

A guide to the fossil invertebrates and plants in the Department of Geology and Palæontology in the British Museum (Natural history) (Page 48 Stock Photo - Alamy

military - Can anyone tell me anything about the markings on these shell casings? - History Stack Exchange

Shell (projectile) - Wikipedia

The Cambridge natural history. Zoology. 394 LEPIDOPTERA. Fig. 197.—Basl;ets, or cases, of Psj'cliidae. A, Amicta quadranrfulnris; B, Apterona (or Cuch- lophora) valvata ; C, Chalia hockinrfi. like the surface of a

Artillery shell cases, fuzes, primers and tubes. – Stephen Taylor, WW2 Relic Hunter

Identification of bullets and cartridge cases (FSC)

Artillery shell cases, fuzes, primers and tubes. – Stephen Taylor, WW2 Relic Hunter

Our Guide to Silver Marks Will Help You Identify Every Piece in Your Collection

Artillery shell cases, fuzes, primers and tubes. – Stephen Taylor, WW2 Relic Hunter

Large calibre markings (The Western Front Museum)

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