Need Some Help Identifying this Old Shell Casing

[Aragorn243]

Can anyone ID this?

I personally believe it is Japanese but no idea to what. I've researched this extensively since I saw the photos and have no idea. Photos of Japanese shells are not very common. Due to the size, I'm thinking maybe anti-aircraft or naval. Described as 16" tall and 3" shell diameter which would make it 76.2mm which matches several of their guns but I can't find a case length anywhere.

Confirmed it is Japanese: Showa 8/16 = August 1941

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