Curt, from the photos you sent me, I think this is an early (1919-20) Sicherheitspolizei marking, possibly from the Prussian district or city of Osnabrück. There is growing evidence that at least some Sipo units used the abbreviation S.P. during this time. What is puzzling to me is the fact that the number on the right rear of the holster does not match the serial number of the gun. The same police property markings on the gun and holster clearly indicate they remained together from the early Weimar era until now. Are you sure the serial numbers are different? From the photo you sent, I could only make out that the number on the holster starts with a 9 as does the serial number of the gun (9865e).
You mentioned that the gun originally belonged to your great-great-grandfather who was a policeman in Germany. Do you know what city he lived in?
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