Your Luger was manufactured in 1918 and issued to the German Imperial Army that year.
After the war it remained in use with the Weimar Republic and received the "1920" property stamp. It seems, from the first picture that ihas the sear safety, which was installed around 1933-34, and indicates Police service. It may have a unit mark on the grip strap.
Looks like a nice Luger, congratulations.
Douglas.
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