This is a cartridge that I found on the Somme a few years back. After some research I haven’t managed to find one like it. It is straight walled I believe as it has no neck, it has a large rim that appears to have 4 slits in it at regular intervals. Could have LL or TT on the headstamp but it is not clear. It is roughly 55mm in length but due to the slight bend it’s difficult to measure. The head is 14mm at its widest point but the damage again makes it difficult to tell. The body is 10mm in diameter.
Any help would be greatly appreciated.