Kevin,
Your report is very thorough, but prompts as many questions as it answers. The crown/N proofs indicate this gun was "commercialized" after WWI; the notch in the front of the receiver indicates this was originally an Artillery LP-08 and has been rebarrelled.
If possible, please take good, sharp, close-up pictures of all the markings on this Luger; it will help in answering questions about it.
The death's head requires further consideration.
--Dwight
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