Hello Waden,
Here is a photo of two things on a luger that make it a police luger :
1. Sear safety (bar on top of the sear mechanism held down with a rivot).
2. Magazine safety (device behind the trigger to block its action if the magazine is out of the frame). The one on my luger was deactivated by having its tab right behind the trigger cut/filed down...
The trigger side plate is removed in this photo to help show details.
Another feature of police lugers is to have the grip strap unit marked with police unit ID numbers and letters.
If your luger does not have these, it is a Weimar era rework (i.e. the 1920 stamping) of a DWM 1918 military luger.
Regards,
Pete... <img border="0" alt="[typing]" title="" src="graemlins/yltype.gif" />