Shellcase

[stillp]

I just measured the inside diameter of the neck (aka the calibre) with a vernier; the neck is a bit out of round so measured at several different points. The smallest measurement was 101.2 mm, the largest 102.4, so it is definitely a 4 inch case (4 x 25.4 = 101.6 mm).
Pete

[stillp]

A reply from the British Ordnance Collectors Network: "4" Naval. Manufactured by ECC - Edward Curran, Cardiff. Worked on by TRE - Royal Naval Armaments Depot (RNAD) Trecwn (TRE)".

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