Mmmm Kay...there is no head stamp.... see for yourself.
Rimmed, semi rimmed and rimless was supposed to be relatively self explanatory of what ammo it is and what it goes to. The manufacturing info is on that little paper ticket on the side of the box. The caliber, lot, date of manufacture and some times the location of arsenal. This is what they did, it's easier to print paper than it is to stamp something.