It appears that the gun has been modified for both the sear and magazine safety, but both are now gone.
Yes, police reworks used the gun's orig. serial number stamped on a later type magazine.
Hard to talk money when we don't understand the European market, sorry.
But as far as it being worth slightly less as a police re-work, while I tend to agree, many others here will vehemently disagree and point out the police Lugers are a collector's category all of their own.
If you get more photos please do close-ups of the left side above the mag. button and also the top. And watch for unit markings on the grip straps.
dju
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