I just received four boxes (280 +/- rounds) of 9mm ammo that is marked "MM 6 44". The boxes are brown, no markings what-so-ever. The ammo is clean, but I imagine it is corrosive primed. I was going to see if it even fired, but was a tad lazy and did not want to clean the pistol afterwards. I will try tomorrow, time given. I know it must be WWII ammo, but who is the manufacturer? I won't know if it is foreign or US made till I shoot it and look at the primer. Is it worth more to collectors? I got it just for plinking till I saw the date on it. What think ya'll?