7,92x57 - MWS 1907 headstamp

Hello, who made this ? Munitionswerke, Schönebeck ?
And in witch period was used this type of signature on 7,92x57 ?
Is that for the civilian market ?

Regards. Ave

I am going to go out on a limb here since no one has answered the question. I have no proof, but I personally have a gut feeling it is a commercial loading by Munitions-Werke, Schönebeck (Elbe).