And to add to JE post,
Here is the head stamps for DWM brass,
DWM B Deutsche Waffen-u. Munitionsfabriken A.-G., Berlin - Borsigwalde, Germany
DWM H Ederlandsche Wapen-en Munitiefabriek NV., "DE KRUITHOORN, 's-Hertogenbosch, Netherlands
DWM K Deutsche Waffen u. Munitionsfabriken...