Hermann,
The tab at the bottom of the recoil spring well with the hole and the slot is the mounting point for a grip safety and its spring; this configuration does not exist on a P-08 style Luger. This is strong evidence that this was, indeed, a 1906 Navy, and the safety marking strongly suggests a First Issue, altered.
The questions about the front of the frame and receiver are more pressing than ever.
--Dwight
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