There are no additional safety features on the Luger line other than the power of the sear spring to prevent a possible discharge if the pistol were dropped with the striker under tention and the safety off.
There were certain pistols made pre war that had firing pin block safeties such as the Walther pistols, (P-38, PPK, PP) but these did not come into play unless the safety was engaged.
I'm afraid most pre-war guns relied on the greatest safety of all; the intelligence and responsibility of the owner. In today's litigeous society, these are no longer considered important factors and thus modern firearms are designed to protect us against ourselves.
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