P131 Luger headstamps
 

I have picked up a lot of 9mm Luger ammo from WW2, but this is my first DWM :)
Not rare I am sure and the box is in poor shape - very 'fractur' looking box, so thought it was a rough WW1 box, but it says 1939 inside

http://www.cartridgecollectors.org/h...adstampcodes#P

This study is very complete, and it includes your WW-II era P131 DWM Berlin cartridge:

http://cartridgecollectors.org/docum...Cartridges.pdf