Unidentifiable head stamp

Gentlemen, it says 221 Rem Fireball DWIOU. I have Lapua and Norma brass, none of them have DWIOU on them. I can’t find this in the headstamp codes.
 
It is norma 221 rem fireball. It is new brass so my question is. Is all the brass marked like this or just this one, and it looks like it may have a large primer pocket is that the case?
 
Guys all my other Norma brass has smaller letters, I've never seen Norma on brass like this before. I feel a little silly, thanks guys for setting me straight.
 

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