Japanese 30.5cm case headstamps for I’d please

[Rrickoshae]

Good morning, can anyone translate the headstamps on this Japanese 30.5cm shell case? I presume it is WW1 era. Amazing that such a large case should find its way to the uk.

many thanks, Dave

 

[ron3350]

It is a WW2 305x496R (30cm) gun case type 7th year. Osaka Army Arsenal December 1944 (ie. 12 Showa 19).

 

[Rrickoshae]

That’s excellent ron3350, many thanks indeed - it was all double Dutch to me!

Dave

 

[Hoeksel]

Nice one, did not know of it yet! Could you verify the length for me and measure the rim diameter for my reference list?