Help in identifying Luger pistol

[Dagaz]

Hi all.
This is my first post; actually, I've created profile just to ask this question ...
So the story is ... Via a donation our local museum recently came to possession of a Luger pistol. With help of intenet and literature I've been so far succesful in identifying various weapons in our collection. However retracing the story of this Luger pistol is too much for me; so I'm turning to members of this forum for help or advice.

- Serial no.: 7178 (numbers 78 repeat on all esential parts of the weapon.
- Below the barel is a suffix to serial no.: 7178 v.
- The pistol is marked on the top with year 1938.
- At toggle joint there is a Mauser logo.
- Proof mark (left): as listed here: http://www.lugerforum.com/lugermarkings/proof-4.html; no. 42; but the upper symbol looks more like a crown.
- On the right side, at the beggining of the barrel there is a german eagle with letter K on it's right.

I could post some photos later if requested.

Hope you'll be able to help me identify this really beautiful piece of history.

Take care and thank you in advance