Three of these cases are identical in size, and to the bases are various marks, with one dated 1917, (photos).
The fourth is slightly longer and narrower and has completely different marks, I am unsure of the age, but it is made with heavier gauge brass.
There are numerous markings on the cases, with one dated 1917.
Only the fourth shell has a used brass charge ring, the other three have been removed. ֍