Nice condition 43 dated Boys anti tank round here on the left and a 50cal BMG and a German WWI 13mm for comparision. I believe the WII stands for an AP tungsten core projectile. And if you look close you can see the tungsten core at the tip of the projectile. I know our Marines used this round in the Pacific. Never less finding the round here is elusive. I think the DA with symbol is the manufacture but I don't know who it is. Interesting how the British and the Germans used a belted cases in a lot of their munitions.