History help 1916 Luger

[34SF]

I am trying to help a neighbor who owns this Luger. I had intended to send this out for an appraisal by one of the commercial experts but after talking with them, it appears that the gun's value is more sentimental than monetary and the cost of the appraisal would add little to the story of the gun. Not to mention the cost of reclaiming the gun through Brady and transfer fees.

I've been able to piece together some some history but I would prefer to have a more experienced perspective rather than my guess work. I have built a presentation box for this gun and would like to include a narrative that explains the marks. I believe this gun has gone through two wars and has story.

The photos below show the serial and proofs. There is almost no "straw" left on anything and the gun is working but reflects its age. The "31" from the serial appears on all the small parts and the grips but I could only find the "F" on one grip.

If this is not the right place for this, any advice would be appreciated.