Unknown hallmark on 122nd Field Artillery DUI

[Flashlarue]

I don't recognize this hallmark. I knew the DUI had the large 331 on the back but I hadn't noticed the fine print along the bottom of the crest. It is so small my camera can't get a good focus on the writing. Anyone recognize it?

 

[Flashlarue]

[Flashlarue]

Here is the best I can do with the fine print.

 

[MBS]

This is the hallmark for S.D. Childs & Co Chicago.

 

Brent

[Flashlarue]

Thank you