A friend of mine has bought this 2 inch mortar round with unusual holes in the top and bottom of the body, believed to be Dutch. The tail fin are WW2 British as well as the body. Not sure about the markings and its function as a practice round, did the holes relived the pressure from the round only travelling a short distance is this mod a proper army mod or is this tinkered home made bodge. Any references would be appreciated.