According to Costanzo, page 190, example 110, says that the circled S indicates an early Simpson rework proof of DWM and Erfurt. It was used to indicate repair or rework of the pistol. Most were reworked for police use and are found on Lugers dated 1910 to 1918. Locations found are on the left barrel chamber, left breech block, right barrel and top of barrel.
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Utah, where gun control means a steady trigger pull
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