dwm or mauser?

I recently picked up this luger and would like to know if it was made by dwm or mauser and its approximate value....gun has grip strap markings l.sd.75 and has a cut out for the sear safety(removed) the gun is in 95% condition with a matching mag..it has a waa66 proof on the right receiver no others that I can see...I presume it is a police gun..any info would be appreciated...thanks..