Alexander:
Don't believe that the "S" stands for Sächisiche or Sanitats.
Rather, believe these markings are consistent with the Prussian Police (Schutzpolizei) Markings, 1922 Instruction. Think the first marking that was "x-out" indicates this Luger was from the Kassel Municipal Police District (#23). Your Luger later came under the control of the Köslin Municipal Police District (#6), waffe number 113.
Hopefully, others will respond confirming/correcting my interpretation and/or adding additional information.
You have a handsome piece of history, congrats.
Ron
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