It is a a Circle S, and in my opinion it is NOT a Simson rework marking.
You find this marking on mainly police guns, and in fact, I personally believe it is a police unit marking.
This is discussed in Don Maus' book and will be discussed in the new Police Lugers book that will come out in the summer.
You can do searches here on the forum and read about Circle S guns.
Ed
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Edward Tinker
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Co-Author of Police Lugers - Co-Author of Simson Lugers
Author of Veteran Bring Backs Vol I, Vol II, Vol III and Vol IV
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