After some thinking, some additional reading and watching the interesting dig find Erfurt with circle/S on the forum I may have an interesting clue:
During 1918 - 1922 the Spandau arsenal was busy refurbishing luger pistols. Documents in German archives survive that state that the modification (rebarreling) of LP08 pistols was done in the Spandau arsenal during that time frame. If they rebarreled LP08 pistols there is no reason why they couldn't also have made other repairs as well.
Circle - S / Spandau .... ?
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