Aussie issue I think 2 x 2" Mortar H.E rounds had these a while they are in what I consider pristine condition both are inert and have inert fuses as well not sure on ones tail fin being 1942 vintage with a '80 mortar body! I have since found the end cap for the initiator cartridge that the one on the left is missing.
I have a 2" smoke round but that is just a hollow round not much to see in that one except its WWII vintage 7-43 on the body - MD /44 on the tail fin and /44 in the initiator end cap.