Costanzo, pg 220 indicates that the S.D.1 thru S.D.7 (all roman numerals) represents the Sicherheitsdienst, the security service having control over all police forces. This mark is usually found on reworked WW1 lugers and a few on 1938 and 1939 models. This is what he is referring to.
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Utah, where gun control means a steady trigger pull
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