Welcome a board Retired Guy.
I have done a bit of research into Police markings in the past, as I own a police P08 myself.
There is a picture of a P08 grip markings in volume ii of the 'Borchardt and Luger automatic pistols', which reads S.D. II R 374, which tranlates into Schutzpolizei Dusseldorf, II kommando, Reviershaft, Waffe 374, (Municipal Police Dusseldorf, 2nd Precinct, Main force, Weapon 374).
Hope that helps
Richard
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