I have had a few of these post ww2 proof rounds, Its marked 2"Mort I, my Question is was there a MkII? Ive never seen one, and if so could it not be a MkII but one of those Black and white Proof of tube rounds that used to be everywhere? Also any info on the manufacturer etc? Also if anyone has similar could they post pics of the markings please. Cheers Tig