Looks to be a AP round from 1918 made by Pem.co
thank for the fast reply .this amp was use for what
Sub calibre shells were used for training. They converted a large calibre gun into an economic training tool. This exact type of shell with the replaced collar was used for training on 3.5 inch guns I seem to recall.
'I do not think we can hope for any better thing now.
We shall stick it out to the end, but we are getting weaker of course, and the end cannot be far.
It seems a pity, but I do not think I can write more. R. SCOTT.
Last Entry - For God's sake look after our people.'
In memory of Capt. Robert Falcon Scott, Edward Wilson, Henry Bowers, Lawrence Oates and Edgar Evans. South Pole Expedition, 30th March 1912.
Thank you davekj for this informations
Glad to help !