Can anybody positively identify this blank cartridge pictured alongside a German military M71/84 ball round. I’m not convinced that these are the same calibre because of the slight differences in case dimensions, partricularly at the shoulder, but perhaps this is just down to manufacturing tolerances. Normally 11mm blanks have a wooden mock bullet seal and I can find no reference to any specimens having this type of folded crimp. This rouns has the usual distinctive Mauser base profile but no headstamp. Any ideas?