Please go to the below web page and have a look at a box of ammo I own. The box is covered in a plastic wrap (mine) and is unopened. I've never fired any of these, I don't have an SMG, and would think of putting any of these into a Luger. I have no info on when this was made. there are markings on one side of the box, but very hard to read. Hope this helps.
http://boards.rennlist.com/upload/9mm.JPG