I have tried to sort this myself but keep having doubts. I think its a 75mm shell, but might have the wrong fuze in it. I thought EP = Ecole de Pyrotechnic Antwerp. But cant find this type of fuze for Belgium’s use in WWI. But as stamped on the fuze C16/40 would that indicate an old fuze brought back into service, or changed in some way. It is a shrapnel shell and still has the shrapnel shot inside.
This is solid shot I believe A/P but has a distinctive driving band which I can not find on the main suspects on the net!
as ever many thanks in advance