What's this?

[stillp]

I have a cartridge case that was left in the garage of the first house I bought, in 1970. It's moved with me to 3 other houses and now I've unearthed it from the clutter in the shed I thought I'd try to ID it. Several people have suggested that it's a 105 mm round from a Centurion, but I'm sure that's wrong, as it's too long and also a little too small. Diameter at the neck is about 101.6 mm.
Thanks for any help.
Pete

 

[TimG]

4" Naval. Manufactured by ECC - Edward Curran, Cardiff. Worked on by TRE - Royal Naval Armaments Depot (RNAD) Trecwn (TRE)

TimG

 

[stillp]

Thanks Tim. Is there anything to show when or where it was demilitarised?
A search for Edward Curran found the following from Wales Online: "In 1914, Curran's developed the expertise to start producing military armaments. During the Second World War, Curran's became a munitions factory once again and was the only British company with the manufacturing capacity to do so." I knew them as Curran Steels when I worked near them in Cardiff.
RNAD Trecwn is fairly close to the part of Pembrokeshire my maternal grandparents came from. The house where I acquired the case was in Llanbradach, about 15 miles north of Cardiff, so perhaps it never moved very far! Unless the other markings state otherwise...
Pete