Questions on my Navy Luger

[swiss1980]

Hi together,

I'm new here in this very interesting forum and would like to ask you some questions on a naval Luger I received from my father some time ago. For me, the condition of the piece is quiet well. Manufactor was DWM. All numbers (also inside the grips) are same. The gun is "Crown N" marked and farther with "Germany" (also on magazine). Caliber is 9mm. I suppose it's a commercial Navy Luger? Am I right? Did something like that exist? Is a Navy Luger a Navy Luger without military markings? When was the gun made?
Thank you alreadey before for all informations.

With kind regards from Switzerland

Remo

P. S. Sorry about my english. Not so used in it :-)