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For the identification of an artillery shell type or origin. Also for the identification of the specific markings on such a shell. In most cases, a photograph is an essential aid to identification as markings can be difficult to accurately describe.

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What was this 1917 shell casing used for?

That appears to be a cartridge case for the QF 3-inch 20 cwt anti-aircraft gun. The "3in 20 cwt" marking on the base clearly indicates that. That nomenclature means the gun fires 3-inch diameter proje …
John Dallman's user avatar