Pete
It seems that you folks have already figured the unit mark ID.
I got the following ID from Klaus Schad
"I'm quite positive that this police unit mark stands for : Landes Polizei
Thueringen Waffe Nr.171."
Based on its serial number I would estimate that your Luger was manufactured in about 1924 by DWM. According to orders dated 1933 the sear and magazine safeties were added. It was common for the police armories to add serial numbers to the sideplate, the receiver and other parts. These additional serial are not as well struck as the factory serial numbers.
You have obtained a new manufactured DWM Luger issued to the Prussian State police with a matching magazine. Neat Luger
Jan
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